Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
RpIILSNM_0009379606RPB1    RPO2    POLR2    POLRA    RPBh1    RPOL2    hsRPB1    hRPB220    POLR2A   
RPIIlsAY1375795693
RPIIlsAF3725035693

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

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Text2Knowledge ... Yong Huang 2002