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| PR:000050377 | IgA1 heavy chain protein, membrane bound isoform (human) | | |  | | |
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| PR:000050376 | IgA1 heavy chain protein, secretory isoform (human) | | |  | | |
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| PR:000050373 | IgA1 heavy chain protein, membrane-bound isoform | | |  | | |
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| PR:000050377 | IgA1 heavy chain protein, membrane bound isoform (human) | | |  | | |
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| PR:000050376 | IgA1 heavy chain protein, secretory isoform (human) | | |  | | |