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| PR:E1C6F0-1 | U1 small nuclear ribonucleoprotein C isoform 1 (chicken) | | |  | | |
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| PR:P09234-1 | U1 small nuclear ribonucleoprotein C isoform 1 (human) | | |  | | |
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| PR:Q62241-1 | U1 small nuclear ribonucleoprotein C isoform 1 (mouse) | | |  | | |
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| PR:Q8JGS0-1 | U1 small nuclear ribonucleoprotein C isoform 1 (zebrafish) | | |  | | |