Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MTNR1AU733279913
MTNR1AU733269823
Mtnr1aNM_00863910090MR    MelR    600665
Mtnr1aXM_34144110116
Mtnr1aNW_04747310116
MTNR1AAY4053309606600665
MTNR1AAY4053319598
MTNR1AAY40533210090600665
MTNR1AAF4355889606600665
MTNR1ANM_0059589606MEL-1A-R    600665
Mtnr1aNT_03946010090600665
MTNR1ANT_0227929606600665

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

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Text2Knowledge ... Yong Huang 2002