Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
dACTNC_0043537227CG11062    activin    dActivin    activin-b    activin-beta   
dACTNM_1436857227CG11062    activin    dActivin    activin-b    activin-beta   
dactNM_2015867955frd2    tdsubc_1d9   

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

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Text2Knowledge ... Yong Huang 2002