Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
nucb2aBC0460777955nucb2    cb638    wu:fa03d10    fa03d10   
nucb2aBC0654377955nucb2    cb638    wu:fa03d10    fa03d10   

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

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Text2Knowledge ... Yong Huang 2002