Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
POLR1BBC0048829606FLJ21921    Rpo1-2    FLJ10816    RPA135   
POLR1BNM_0190149606RPA135    Rpo1-2    FLJ10816    FLJ21921   
POLR1BNT_0221359606

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

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Text2Knowledge ... Yong Huang 2002