Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RPB31BC0281579606hRPB33    hsRPB3    RPB3    POLR2C   
RPB31BC0004099606hRPB33    hsRPB3    RPB3    POLR2C   
RPB31BC0031599606hRPB33    hsRPB3    RPB3    POLR2C   
RPB31NM_0026949606RPB3    hRPB33    hsRPB3    POLR2C   
RPB31NM_0329409606RPB3    hRPB33    hsRPB3    POLR2C   

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

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Text2Knowledge ... Yong Huang 2002