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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000018296 | SMAD family member 2, 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: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: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) | | |  | | |