Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CG11062AE0038467227activin-beta   
CG11062NC_0043537227dACT    activin    dActivin    activin-b    activin-beta   
CG11062NM_1436857227dACT    activin    dActivin    activin-b    activin-beta   

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

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Text2Knowledge ... Yong Huang 2002