PON2 and type 2 diabetes mellitus: A study conducted on 40 Iranian patients with type 2 diabetes, aged 40–65 years, associated the A allele (SNP PON-2-G148A), and C allele (SNP PON-2-C311S) with quantitative insulin sensitivity check index (QUICKI) and homeostasis model assessment for β-cell function (HOMA-BCF).