The major histocompatibility complex plays an important role in immune response,and the polymorphism and response mechanism has been the hot spot of basic immunology.Rat genome draft has been drawn to complete,and it has gone deep into the study on genetic,genome,evolutionary,and functional aspects at the molecular level.This review of the RT1 complex,the major histocompatibility complex(MHC) of rat,primarily introduces its genetic structure and gives the physical map of RT1 complex.Study on the RT1 complex...