Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cyp21a1NM_0099951009021OH    21-OH    21OHA    Cyp21    Oh21-1    CYP21OH-A   
Cyp21a1NW_04759710116
Cyp21a1NT_03964910090
Cyp21a1NT_03966210090
Cyp21a1NM_0571011011621-OH    Cyp21   
Cyp21a1BX88304410116

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

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Text2Knowledge ... Yong Huang 2002