Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
polr1aBC0555007955wu:fa26a03    fa26a03    cb934   
POLR1ABC0171159606DKFZP586M0122    FLJ21915    RPO1-4    RPA1   
POLR1ANM_0154259606RPA1    RPO1-4    FLJ21915    DKFZP586M0122   
POLR1ANT_0221849606

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

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Text2Knowledge ... Yong Huang 2002