Your Query returns 6 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MYF4NM_03118910090myo    Myog    159980
MYF4BC0538999606MYOGENIN    MYOG    159980
MYF4NM_0024799606MYOGENIN    MYOG    159980
myf4AY0935938049
MYF4AF0505019606159980
myf4X621559606159980

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

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Text2Knowledge ... Yong Huang 2002