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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |
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    |
| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025938 | SMAD family member 2 isoform Short phosphorylated 1 (human) | | |  | | |
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| PR:000045494 | SMAD family member 2 isoform Short unphosphorylated 1 (human) | | |  | | |
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| PR:000025960 | SMAD family member 2 isoform unphosphorylated 1 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |
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| PR:000045494 | SMAD family member 2 isoform Short unphosphorylated 1 (human) | | |  | | |
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| PR:000000474 | SMAD family member 2 sequence variant 5 (human) | | |  | | |
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| PR:000000473 | SMAD family member 2 sequence variant D450E (human) | | |  | | |
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| PR:000000471 | SMAD family member 2 sequence variant L440R (human) | | |  | | |
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| PR:000000472 | SMAD family member 2 sequence variant P445H (human) | | |  | | |
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| PR:000000470 | SMAD family member 2 sequence variant R133C (human) | | |  | | |
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| PR:000049281 | SMAD family member 2, initiator methionine removed form (human) | | |  | | |
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| PR:000061944 | SMAD family member 2 sequence variant A354T, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000060357 | SMAD family member 2 sequence variant D300A, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000060862 | SMAD family member 2 sequence variant D300N, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000060657 | SMAD family member 2 sequence variant D300V, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000064349 | SMAD family member 2 sequence variant P305L, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000062120 | SMAD family member 2 sequence variant P305Q, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000063661 | SMAD family member 2 sequence variant S464*, initiator methionine removed form (human) | | |  | | |
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| PR:000060522 | SMAD family member 2 sequence variant S464L, initiator methionine removed form (human) | | |  | | |
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| PR:000063912 | SMAD family member 2 sequence variant S467P, initiator methionine removed form (human) | | |  | | |
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| PR:000049282 | SMAD family member 2, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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| PR:000062419 | SMAD family member 2, initiator methionine removed phosphorylated 2 (human) | | |  | | |
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| PR:000049283 | SMAD family member 2, initiator methionine removed phosphorylated 5 (human) | | |  | | |
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| PR:000049284 | SMAD family member 2, initiator methionine removed ubiquitinated form (human) | | |  | | |
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| PR:000064775 | SMAD family member 2, initiator methionine removed phosphorylated and ubiquitinated 1 (human) | | |  | | |
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| PR:000049284 | SMAD family member 2, initiator methionine removed ubiquitinated form (human) | | |  | | |
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| PR:000064775 | SMAD family member 2, initiator methionine removed phosphorylated and ubiquitinated 1 (human) | | |  | | |
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    |
| PR:000025942 | SMAD family member 2 isoform Long phosphorylated 1 (mouse) | | |  | | |
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| PR:000036482 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form (mouse) | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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    |
| PR:000025943 | SMAD family member 2 isoform Short phosphorylated 1 (mouse) | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |
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    |
| PR:000025942 | SMAD family member 2 isoform Long phosphorylated 1 (mouse) | | |  | | |
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| PR:000036482 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form (mouse) | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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    |
| PR:000000572 | SMAD family member 2 isoform Long acetylated and phosphorylated form | | |  | | |
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| PR:000000649 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000000573 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form | | |  | | |
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| PR:000000654 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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| PR:000036482 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form (mouse) | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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| PR:000000574 | SMAD family member 2 isoform Long phosphorylated form | | |  | | |
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| PR:000000572 | SMAD family member 2 isoform Long acetylated and phosphorylated form | | |  | | |
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    |
| PR:000000649 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 | | |  | | |
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    |
| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000000650 | SMAD family member 2 isoform Long phosphorylated 1 | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025942 | SMAD family member 2 isoform Long phosphorylated 1 (mouse) | | |  | | |
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| PR:000000651 | SMAD family member 2 isoform Long phosphorylated 2 | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000000652 | SMAD family member 2 isoform Long phosphorylated 3 | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000000653 | SMAD family member 2 isoform Long phosphorylated 4 | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000000573 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form | | |  | | |
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| PR:000000654 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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| PR:000036482 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated form (mouse) | | |  | | |
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| PR:000036555 | SMAD family member 2 isoform Long phosphorylated and ubiquitinated 1 (mouse) | | |  | | |
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| PR:000002570 | SMAD family member 2 isoform Long unmodified form | | |  | | |
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| PR:000026718 | SMAD family member 2 isoform Long, initiator methionine removed form | | |  | | |
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| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025938 | SMAD family member 2 isoform Short phosphorylated 1 (human) | | |  | | |
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| PR:000045494 | SMAD family member 2 isoform Short unphosphorylated 1 (human) | | |  | | |
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    |
| PR:000025943 | SMAD family member 2 isoform Short phosphorylated 1 (mouse) | | |  | | |
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| PR:000000575 | SMAD family member 2 isoform Short acetylated and phosphorylated form | | |  | | |
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| PR:000000655 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 | | |  | | |
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| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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    |
| PR:000000576 | SMAD family member 2 isoform Short phosphorylated form | | |  | | |
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    |
| PR:000000575 | SMAD family member 2 isoform Short acetylated and phosphorylated form | | |  | | |
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    |
| PR:000000655 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 | | |  | | |
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    |
| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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    |
| PR:000000656 | SMAD family member 2 isoform Short phosphorylated 1 | | |  | | |
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| PR:000025938 | SMAD family member 2 isoform Short phosphorylated 1 (human) | | |  | | |
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| PR:000025943 | SMAD family member 2 isoform Short phosphorylated 1 (mouse) | | |  | | |
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    |
| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |
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    |
| PR:000002570 | SMAD family member 2 isoform Long unmodified form | | |  | | |
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| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |
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    |
| PR:000002570 | SMAD family member 2 isoform Long unmodified form | | |  | | |
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| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |
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    |
| PR:000018296 | SMAD family member 2, initiator methionine removed form | | |  | | |
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    |
| PR:000026718 | SMAD family member 2 isoform Long, initiator methionine removed form | | |  | | |
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    |
| PR:000049281 | SMAD family member 2, initiator methionine removed form (human) | | |  | | |
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    |
| PR:000061944 | SMAD family member 2 sequence variant A354T, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000060357 | SMAD family member 2 sequence variant D300A, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000060862 | SMAD family member 2 sequence variant D300N, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000060657 | SMAD family member 2 sequence variant D300V, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000064349 | SMAD family member 2 sequence variant P305L, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000062120 | SMAD family member 2 sequence variant P305Q, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000063661 | SMAD family member 2 sequence variant S464*, initiator methionine removed form (human) | | |  | | |
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    |
| PR:000060522 | SMAD family member 2 sequence variant S464L, initiator methionine removed form (human) | | |  | | |
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    |
| PR:000063912 | SMAD family member 2 sequence variant S467P, initiator methionine removed form (human) | | |  | | |
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    |
| PR:000049282 | SMAD family member 2, initiator methionine removed phosphorylated 1 (human) | | |  | | |
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    |
| PR:000062419 | SMAD family member 2, initiator methionine removed phosphorylated 2 (human) | | |  | | |
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    |
| PR:000049283 | SMAD family member 2, initiator methionine removed phosphorylated 5 (human) | | |  | | |
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    |
| PR:000049284 | SMAD family member 2, initiator methionine removed ubiquitinated form (human) | | |  | | |
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    |
| PR:000064775 | SMAD family member 2, initiator methionine removed phosphorylated and ubiquitinated 1 (human) | | |  | | |
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| PR:000061858 | SMAD family member 3 ADP-ribosylated and phosphorylated 1 (human) | | |  | | |
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| PR:000036557 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000026333 | SMAD family member 3 isoform 1 phosphorylated 1 (human) | | |  | | |
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| PR:000063639 | SMAD family member 3 sequence variant D258N phosphorylated 1 (human) | | |  | | |
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| PR:000063580 | SMAD family member 3 sequence variant R268C phosphorylated 1 (human) | | |  | | |
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| PR:000060563 | SMAD family member 3 sequence variant R268H phosphorylated 1 (human) | | |  | | |
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| PR:000063486 | SMAD family member 3 sequence variant S425C (human) | | |  | | |
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| PR:000062539 | SMAD family member 3 sequence variant S425F (human) | | |  | | |
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| PR:000049287 | SMAD family member 3 ubiquitinated form (human) | | |  | | |
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| PR:000064859 | SMAD family member 3 phosphorylated and ubiquitinated 1 (human) | | |  | | |
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    |
| PR:000036558 | SMAD family member 3 isoform 1 phosphorylated 1 (mouse) | | |  | | |
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| PR:000036560 | SMAD family member 3 isoform 1 phosphorylated 2 (mouse) | | |  | | |
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| PR:000036561 | SMAD family member 3 isoform 1 phosphorylated 3 (mouse) | | |  | | |
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    |
| PR:000036557 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 (human) | | |  | | |
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    |
| PR:000026333 | SMAD family member 3 isoform 1 phosphorylated 1 (human) | | |  | | |
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    |
| PR:000036558 | SMAD family member 3 isoform 1 phosphorylated 1 (mouse) | | |  | | |
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    |
| PR:000036560 | SMAD family member 3 isoform 1 phosphorylated 2 (mouse) | | |  | | |
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    |
| PR:000036561 | SMAD family member 3 isoform 1 phosphorylated 3 (mouse) | | |  | | |
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    |
| PR:000000577 | SMAD family member 3 isoform 1 acetylated and phosphorylated form | | |  | | |
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    |
| PR:000000657 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 | | |  | | |
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    |
| PR:000036557 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 (human) | | |  | | |
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    |
| PR:000000578 | SMAD family member 3 isoform 1 phosphorylated form | | |  | | |
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    |
| PR:000000577 | SMAD family member 3 isoform 1 acetylated and phosphorylated form | | |  | | |
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    |
| PR:000000657 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 | | |  | | |
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    |
| PR:000036557 | SMAD family member 3 isoform 1 acetylated and phosphorylated 1 (human) | | |  | | |
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    |
| PR:000000658 | SMAD family member 3 isoform 1 phosphorylated 1 | | |  | | |
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    |
| PR:000026333 | SMAD family member 3 isoform 1 phosphorylated 1 (human) | | |  | | |
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    |
| PR:000036558 | SMAD family member 3 isoform 1 phosphorylated 1 (mouse) | | |  | | |
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    |
| PR:000000659 | SMAD family member 3 isoform 1 phosphorylated 2 | | |  | | |
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    |
| PR:000036560 | SMAD family member 3 isoform 1 phosphorylated 2 (mouse) | | |  | | |
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    |
| PR:000000660 | SMAD family member 3 isoform 1 phosphorylated 3 | | |  | | |
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    |
| PR:000036561 | SMAD family member 3 isoform 1 phosphorylated 3 (mouse) | | |  | | |
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    |
| PR:000027746 | TGF-beta receptor-regulated SMAD family member protein phosphorylated form | | |  | | |
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    |
| PR:000027747 | TGF-beta receptor-regulated SMAD family member protein phosphorylated form (human) | | |  | | |
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    |
| PR:000027744 | TGF-beta receptor-regulated SMAD family member protein unmodified form | | |  | | |
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    |
| PR:000027745 | TGF-beta receptor-regulated SMAD family member protein unmodified form (human) | | |  | | |