ITLN1 and type 2 diabetes mellitus: Omentin, a newly identified adipokine with 313 amino acids, encoded by a gene present in chromosomal region 1q22-q23, is related to type 2 diabetes [3, 5]. There are two highly homologous isoforms of omentin, omentin-1 and omentin-2; the former is the major circulating form in human plasma [6].