Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
activinNM_01056510090Inhbc   
activinNM_00838010090Inhba   
activinNM_00838210090Inhbe   
activinBC0051619606MGC4638    INHBE   
activinBC04884510090Inhbb   
activinBC02614010090Inhbc   
activinBC05352710090Inhba   
activinBC01040410090Inhbe   
activinNM_0314799606MGC4638    INHBE   
activinNC_0043537227dACT    CG11062    dActivin    activin-b    activin-beta   
activinNM_1436857227dACT    CG11062    dActivin    activin-b    activin-beta   
activinAB1166418090

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

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Text2Knowledge ... Yong Huang 2002