Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mdkk-1NM_01005110090Dkk1   
mdkk-1BC05018910090Dkk1   
mdkk-1AF03043310090

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

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Text2Knowledge ... Yong Huang 2002