Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
wu:fe14b09BC0454437955fe14b09    Cbx1    zgc:55739   
wu:fe14b09NM_1997467955Cbx1    fe14b09    zgc:55739   

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

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Text2Knowledge ... Yong Huang 2002