Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
msx2AJ2777539615
msx2AJ3031049615
msx2AJ3031059615
Msx2NM_01360110090Hox8    Hox-8    Hox8.1    123101
Msx2NW_04748910116
Msx2AH0049519606123101
Msx2L224989606123101
Msx2L224999606123101
Msx2NM_01298210116
MSX2BC0155099606CRS2    FPP    HOX8    PFM    PFM1    MSH    123101
MSX2X692959606123101
MSX2NM_0024499606FPP    MSH    PFM    CRS2    HOX8    PFM1    123101
Msx2AH00003410090123101
Msx2L1173810090123101
Msx2L1173910090123101
Msx2NT_03958510090123101
MSX2NT_0231339606123101

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

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Text2Knowledge ... Yong Huang 2002