Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
C21orf76BC0578299606PRED44    2-21    C21orf11    ORF9    FAM3B   
C21orf76NM_05818696062-21    ORF9    PRED44    C21orf11    FAM3B   
C21orf76NM_20696496062-21    ORF9    PRED44    C21orf11    FAM3B   

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

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Text2Knowledge ... Yong Huang 2002