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| PR:Q39244 | U1 small nuclear ribonucleoprotein A (Arabidopsis thaliana) | | |  | | |
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| PR:P43332 | U1 small nuclear ribonucleoprotein A (fruit fly) | | |  | | |
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| PR:P09012 | U1 small nuclear ribonucleoprotein A (human) | | |  | | |
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| PR:000049306 | U1 small nuclear ribonucleoprotein A, initiator methionine removed form (human) | | |  | | |
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| PR:Q62189 | U1 small nuclear ribonucleoprotein A (mouse) | | |  | | |
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| PR:000021518 | U1 small nuclear ribonucleoprotein A, initiator methionine removed form | | |  | | |
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| PR:000049306 | U1 small nuclear ribonucleoprotein A, initiator methionine removed form (human) | | |  | | |
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| PR:Q54J05 | U2 small nuclear ribonucleoprotein B'' (Dictyostelium discoideum) | | |  | | |