Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ActxBC06316610116Actb   
ActxNM_03114410116Actb   
ActxNM_00739310090beta-actin    E430023M04Rik    Actb   
actxAJ006342562

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

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Text2Knowledge ... Yong Huang 2002