Your Query returns 19 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
msx1X620979031
msx1AY5258448296
Msx1NM_01083510090msh    Hox7    Hox-7    Hox7.1    142983
Msx1NW_04742910116
MSX1AF4264329606142983
MSX1BC0212859606HOX7    HYD1    142983
MSX1AY4184559606142983
MSX1AY4184569598
MSX1AY41845710090142983
MSX1NM_0024489606HOX7    HYD1    142983
MSX1NM_1747989913
Msx1NT_03930310090142983
Msx1AF30857210090142983
Msx1AF26772810090Hox7    142983
Msx1BC01642610090Hox7    Hox7.1    msh    142983
MSX1NT_0060519606142983
MSX1BC0673539606HOX7    HYD1    142983
Msx1NM_03105910116
msx1AJ55555510116

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

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Text2Knowledge ... Yong Huang 2002