<prompt> True about MHC-Present on chromosomeClass II comprises A, B, C lociClass III has complementClass I is involved in mixed leucocyte reaction  <response>: Robbins basic pathology 9th edition page no 102 Mainly major histocompatibility complex moleculeMHC are mainly divided into two MHC1 and MHC2. But several other protiens are encoded in the MHC locus, and some of whicha are called as MHC3 molecules. These include the complement componentsC2, C3andbf and the ctokine tumour necrosing factor and lymphotoxin. 