Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
LMX1NM_1773989606LMX-1    LMX1.1    LMX1A    600298
LMX1NM_1773999606LMX-1    LMX1.1    LMX1A    600298
LMX1AY1631589031
Lmx1U418239031

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

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Text2Knowledge ... Yong Huang 2002