<prompt> True statements are all, exceptChromosome six harbours the gene for MHCGenes encoding compliments are located adjacent to class IMonocytes have MHC class II antigens on their surfacesClass III MHC does not encode complement  <response>: Class I antigen Expressed on all nucleated cells and platelets Encode cell surface glycoproteins Encoded by 3 closely related loci HLA-A, HLA-B HLA-C CD8 T cells widely express class I HLA antigen Class II antigen Expressed on macrophages, B cells and T cells Encode cell surface glycoproteins Have a single loci HLA-D with 3 surface loci DR,DQ,DP Class III antigen Encodes complements of the complement system Genes coding for histocompatibility antigens are clustered on a small segment of chromosome 6. This cluster constitutes human MHC or HLA complex The class III molecules loci , are present in between the loci for class I and class II molecules ref: Harrisons 18e p2685-2687 