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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) | | |  | | |