CCR5 and type 2 diabetes mellitus: One of these genes associated with type 2 diabetes is the insulin receptor substrate 1 (IRS1, OMIM association number, 147545) (Alharbi, Khan, Abotalib, & Al‐Hakeem, 2014; Alharbi, Khan, Munshi et al., 2014; Brender et al., 2013; Brunetti, Chiefari, & Foti, 2014) and another is the C‐C motif chemokine receptor5(CCR5, OMIM association number, 601373) (Balistreri et al., 2007; Mokubo et al., 2006; Muntinghe et al., 2009).