Figure 1: Schematic representation of nonclassical major histocompatibility complex (MHC) class I genes of human, mouse and rat: Nonclassical MHC class I genes found in human, mouse, rat in chromosome 6, 17 and 20 respectively. The nonclassical MHC-I genes of human leukocyte antigen (HLA-E,-F,-G,-H.) are found in locus p21.1, mouse (Qa-1, Qa-2) are found in B1 region, rat (RT1-M4,-M5,-M6,-S3) are found in region 20p12 of chromosome 20