Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cyp21a2-psNG_0013631009021OHB    Cyp21B    Oh21-2    Cyp21-ps1    Cyp21a2ps   
Cyp21a2-psNT_03964910090Cyp21B   
Cyp21a2-psNT_03966210090Cyp21B   

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

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Text2Knowledge ... Yong Huang 2002