Your Query returns 19 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpb5Z997534896SPAC23C4.15   
RPB5BC0044419606XAP4    hRPB25    hsRPB5    RPABC1    POLR2E   
RPB5NM_0026959606XAP4    RPABC1    hRPB25    hsRPB5    POLR2E   
RPB5BC02684210090XAP4    25kDa    Polr2e   
RPB5BC03768110090XAP4    25kDa    Polr2e   
RPB5BC04552110090XAP4    25kDa    Polr2e   
RPB5BC0341449606RPABC1    XAP4    hRPB25    hsRPB5    POLR2E   
RPB5NM_1367867227CG11979   
RPB5NT_0337787227CG11979   
Rpb5AY0713297227
RPB5S597744932
RPB5Z360234932
rpb5AE010362190192MK0688   
RPB5X713294932
RPB5AF2252064911
rpb5NC_0034244896SPAC23C4.15   
RPB5NC_003551190192
Rpb5AE0038287227
RPB5NC_0011344932

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

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Text2Knowledge ... Yong Huang 2002