Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpoB1AY016744573rpoB   
rpoB1AE0066592287SSO0227   
rpoB1AE010794188937MA1264   
rpoB1NC_000917224325
rpoB1NC_003552188937
rpoB1NC_0027542287
rpoB1BX95722239152
rpoB10N/A

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

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Text2Knowledge ... Yong Huang 2002