Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
beta-actinNM_00739310090Actx    E430023M04Rik    Actb   
beta-actinAB0511049685
beta-actinAJ3121939823
beta-actinM7240510090
beta-actinM7240710090
beta-actinM7240910090
beta-actinM7240610090
beta-actinM7240810090
beta-actinM7241010090

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

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Text2Knowledge ... Yong Huang 2002