Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
POLR2KBC0181579606RPB7.0    hRPB7.0    hsRPB10a    RPB12    ABC10-alpha    RPB10alpha    RPABC4    606033
POLR2KBC0008069606RPB7.0    hRPB7.0    hsRPB10a    RPB12    ABC10-alpha    RPB10alpha    RPABC4    606033
POLR2KAJ2520789606606033
POLR2KAY3989679606606033
POLR2KAY3989689598
POLR2KAY39896910090606033
POLR2KNM_0050349606RPB12    RPABC4    RPB7.0    hRPB7.0    hsRPB10a    RPB10alpha    ABC10-alpha    606033
Polr2kBC02854310090MafY    RPB12    RPABC4    RPB7.0    RPB10alpha    606033
Polr2kNM_02312710090MafY    Mt1a    RPB12    RPABC4    RPB7.0    RPB10alpha    606033
POLR2KNT_0080469606606033

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

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Text2Knowledge ... Yong Huang 2002