Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
IGKV621NG_0008349606A26    IGKV6-21   
IGKV621NT_0221849606A26    IGKV6-21   

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

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Text2Knowledge ... Yong Huang 2002