Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpoB2AY016745573rpoB   
rpoB2AE0066592287SSO3254   
rpoB2AE010794188937MA1265   
rpoB2NC_000917224325
rpoB2NC_003552188937
rpoB2NC_0027542287
rpoB2BX95722239152
rpoB2NC_005791267377

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

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Text2Knowledge ... Yong Huang 2002