Your Query returns 7 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hmx1NM_01044510090142992
HMX1NM_0189429606H6    142992
Hmx1AF00961410090142992
hmx1AF00936710090142992
Hmx1NT_03930210090142992
HMX1NT_0796179606142992
HMX1NC_0011444932

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

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Text2Knowledge ... Yong Huang 2002