Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hRPB33BC0281579606hsRPB3    RPB31    RPB3    POLR2C   
hRPB33BC0004099606hsRPB3    RPB31    RPB3    POLR2C   
hRPB33BC0031599606hsRPB3    RPB31    RPB3    POLR2C   
hRPB33NM_0026949606RPB3    RPB31    hsRPB3    POLR2C   
hRPB33NM_0329409606RPB3    RPB31    hsRPB3    POLR2C   

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

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Text2Knowledge ... Yong Huang 2002