Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Mash1NM_00855310090ASH1    Ascl1   
MASH1BC0312999606ASH1    HASH1    ASCL1   
MASH1BC0044259606ASH1    HASH1    ASCL1   
MASH1BC0023419606ASH1    HASH1    ASCL1   
MASH1BC0031349606ASH1    HASH1    ASCL1   
MASH1NM_0043169606ASH1    HASH1    ASCL1   
Mash1U6853410090Ascl1   
Mash1NM_02238410116Ascl1   

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

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Text2Knowledge ... Yong Huang 2002