Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Ascl1NM_00855310090ASH1    Mash1    100790
Ascl1NW_04777410116
ASCL1BC0312999606ASH1    HASH1    MASH1    100790
ASCL1BC0044259606ASH1    HASH1    MASH1    100790
ASCL1BC0023419606ASH1    HASH1    MASH1    100790
ASCL1BC0031349606ASH1    HASH1    MASH1    100790
ASCL1AY4099419606100790
ASCL1AY4099429598
ASCL1AY40994310090100790
ASCL1U776169606100790
ASCL1NM_0043169606ASH1    HASH1    MASH1    100790
Ascl1NT_03950010090100790
Ascl1U6853410090Mash1    100790
Ascl1BC05574810090ASH1    100790
ASCL1NT_0195469606100790
ASCL1NM_2044129031
Ascl1NM_02238410116Mash1   

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

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Text2Knowledge ... Yong Huang 2002