Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
C21orf2BC0313009606YF5    A2    603191
C21orf2AP0017549606603191
C21orf2NM_0049289606A2    YF5    603191
C21orf2NT_0115159606603191

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

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Text2Knowledge ... Yong Huang 2002