Your Query returns 4 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
activin-betaAY1216867227
activin-betaAE0038467227
activin-betaNC_0043537227dACT    CG11062    activin    dActivin    activin-b   
activin-betaNM_1436857227dACT    CG11062    activin    dActivin    activin-b   

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

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Text2Knowledge ... Yong Huang 2002