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| PR:P10747 | T-cell-specific surface glycoprotein CD28 (human) | | |  | | |
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| PR:000071913 | T-cell-specific surface glycoprotein CD28 cysteinylated 1 (human) | | |  | | |
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| PR:P10747-1 | T-cell-specific surface glycoprotein CD28 isoform 1 (human) | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |
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| PR:P10747-2 | T-cell-specific surface glycoprotein CD28 isoform h2 (human) | | |  | | |
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| PR:P10747-3 | T-cell-specific surface glycoprotein CD28 isoform h3 (human) | | |  | | |
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| PR:P10747-4 | T-cell-specific surface glycoprotein CD28 isoform h4 (human) | | |  | | |
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| PR:P10747-5 | T-cell-specific surface glycoprotein CD28 isoform h5 (human) | | |  | | |
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| PR:P10747-6 | T-cell-specific surface glycoprotein CD28 isoform h6 (human) | | |  | | |
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| PR:P10747-7 | T-cell-specific surface glycoprotein CD28 isoform h7 (human) | | |  | | |
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| PR:000075395 | T-cell-specific surface glycoprotein CD28 methylated 1 (human) | | |  | | |
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| PR:000078595 | T-cell-specific surface glycoprotein CD28 methylated 2 (human) | | |  | | |
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| PR:000026870 | T-cell-specific surface glycoprotein CD28, signal peptide removed form (human) | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |
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| PR:P31041 | T-cell-specific surface glycoprotein CD28 (mouse) | | |  | | |
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| PR:P31041-1 | T-cell-specific surface glycoprotein CD28 isoform 1 (mouse) | | |  | | |
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| PR:P31042 | T-cell-specific surface glycoprotein CD28 (rat) | | |  | | |
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| PR:P31043 | T-cell-specific surface glycoprotein CD28 homolog (chicken) | | |  | | |
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| PR:000025788 | T-cell-specific surface glycoprotein CD28 isoform 1 | | |  | | |
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| PR:P10747-1 | T-cell-specific surface glycoprotein CD28 isoform 1 (human) | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |
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| PR:P31041-1 | T-cell-specific surface glycoprotein CD28 isoform 1 (mouse) | | |  | | |
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| PR:000026613 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed form | | |  | | |
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| PR:000025789 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |
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| PR:000018541 | T-cell-specific surface glycoprotein CD28, signal peptide removed form | | |  | | |
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| PR:000026613 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed form | | |  | | |
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| PR:000025789 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |
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| PR:000026870 | T-cell-specific surface glycoprotein CD28, signal peptide removed form (human) | | |  | | |
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| PR:000025790 | T-cell-specific surface glycoprotein CD28 isoform 1, signal peptide removed phosphorylated 1 (human) | | |  | | |