Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pax-1NM_00878010090un    wt    hbs    hunchback    undulated    Pax1   
Pax-1X824429031
pax-1U533366239
Pax-1M6922210090
Pax-1AH00471310095
Pax-1S7690010095
Pax-1S7690110095
Pax-1AF0394039031

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

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Text2Knowledge ... Yong Huang 2002