Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
IGHG4L134879606147130
IGHG4AF3004329598A1   
IGHG4AF3004339598A2   
IGHG4AF3004469593
IGHG4BC0259859606147130
IGHG4AY2925209544
IGHG4AY2925219544
IGHG4AY2925229544
IGHG4AY2925239544
IGHG4AY2925249544
IGHG4AY2925259544
IGHG4AF1092139606147130
IGHG4AJ2947339606147130
IGHG4AJ0015639606147130
IGHG4AJ0015649606147130

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

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Text2Knowledge ... Yong Huang 2002