Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
IGHG2M184049606147110
IGHG2AF3004269600A1   
IGHG2AF3004279600A2   
IGHG2AF3004369598
IGHG2AF3004409544
IGHG2AF300444100937
IGHG2AF3004489593
IGHG2AF4496169606IGHG2*03    147110
IGHG2AF4496179606IGHG2*04    147110
IGHG2AF4496189606IGHG2*05    147110
IGHG2AY2925149544
IGHG2AY2925159544
IGHG2AY2925169544
IGHG2AY2925179544
IGHG2AY2925189544
IGHG2AY2925199544
IGHG2AJ2947319606147110

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

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Text2Knowledge ... Yong Huang 2002