Your Query returns 7 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
InhbeNM_00838210090activin   
INHBEBC0051619606MGC4638    activin   
InhbeNT_08185610090
InhbeBC01040410090activin   
INHBENM_0314799606MGC4638    activin   
INHBENT_0294199606
InhbeNM_03181510116

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

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Text2Knowledge ... Yong Huang 2002