Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MORANM_01307110116Oprm1   
morAM94775303
morAAY323811303
morAAE014757206672
morAAJ310142156204
morANC_004307206672

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

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Text2Knowledge ... Yong Huang 2002