Your Query returns 22 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RPB3BC0281579606hRPB33    hsRPB3    RPB31    POLR2C   
RPB3BC0004099606hRPB33    hsRPB3    RPB31    POLR2C   
RPB3BC0031599606hRPB33    hsRPB3    RPB31    POLR2C   
RPB3NG_0007507227br17    l34Dg    polII    CG7885    rpII33    CT23860    l(2)34Dg    l(2)br17    RNA polII    RNA pol II    l(2)k05605    BG:DS00941.10    RNA polymerase II   
RPB3NM_0026949606RPB31    hRPB33    hsRPB3    POLR2C   
RPB3NM_0329409606RPB31    hRPB33    hsRPB3    POLR2C   
RPB3NM_0580717227br17    l34Dg    polII    CG7885    Rpll33    rpII33    l(2)34Dg    l(2)br17    l(2)k05605   
RPB3NM_1650647227br17    l34Dg    polII    CG7885    Rpll33    rpII33    l(2)34Dg    l(2)br17    l(2)k05605   
RPB3NT_0337797227br17    l34Dg    polII    CG7885    Rpll33    rpII33    l(2)34Dg    l(2)br17    l(2)k05605   
RPB3AJ1336507227
rpb3AE00504364091VNG1136G   
rpb3AF5106425741
rpb3AL0319664896SPCC1442.10c   
RPB3Z468814932
rpb3AJ01059255529
rpb3AE00443764091VNG1136G   
rpb3NC_0034214896SPCC1442.10c   
RPB3AJ2241439606
rpb3AJ2241449606
rpb3NC_00260764091
rpb3NC_00275355529
RPB30N/A

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002