Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
LMX1.2NM_01072510090LMX1.1    Lmx1b   
LMX1.2NM_0023169606NPS1    LMX1B   

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

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Text2Knowledge ... Yong Huang 2002