Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pmx2aNM_00888710090Arix    Pmx2    Phox2    Phox2a   
PMX2ABC0415649606NCAM2    ARIX    CFEOM2    FEOM2    PHOX2A   
PMX2ANM_0051699606ARIX    FEOM2    NCAM2    CFEOM2    MGC52227    PHOX2A   

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

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Text2Knowledge ... Yong Huang 2002