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Aim: IL-12, a strong candidate gene for allergic diseases, can induce inflammation factors produced by natural-killer and T lymphocytes.This study was to investigate the possible roles of IL-12B-6415 (CTCTAA/GC) site in the promoter region and IL12B 3 untranslated region (UTR) (C/A), this SNP is now designated rs3212227 in penicillin allergy, and to explore the association between the polymorphisms of IL-12 gene and the levels of specific IgEs in penicillin allergy.