Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpb12AL1097314896SPBC19C2.03    rpc10   
RPB12BC0181579606RPB7.0    hRPB7.0    hsRPB10a    ABC10-alpha    RPB10alpha    RPABC4    POLR2K    606033
RPB12BC0008069606RPB7.0    hRPB7.0    hsRPB10a    ABC10-alpha    RPB10alpha    RPABC4    POLR2K    606033
RPB12NM_0050349606RPABC4    RPB7.0    hRPB7.0    hsRPB10a    RPB10alpha    ABC10-alpha    POLR2K    606033
RPB12BC02854310090MafY    RPABC4    RPB7.0    RPB10alpha    Polr2k    606033
RPB12NM_02312710090MafY    Mt1a    RPABC4    RPB7.0    RPB10alpha    Polr2k    606033
RPB12NC_0011404932RPC10   
rpb12AF5106505741
rpb12D896344896
RPB12U103974932
rpb12NC_0034234896SPBC19C2.03    rpc10   

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

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Text2Knowledge ... Yong Huang 2002