1. Histocompatibility is a term synonymous with compatibility or incompatibility of transplanted tissues.2. Immunologists had discovered the major histocompatibility antigens in their studies of transplanted organs. 3. They are known to biologists as MHC genes, for major histocompatibility complex. 4. Antigen presenting cells present antigens in the form of peptides on histocompatibility molecules. 5. Major histocompatibility antigen testing may be performed to investigate genetic susceptibility to uveitis. 6. These genes are all within the human major histocompatibility complex class III region. 7. The macaque genome has 33 major histocompatibility genes, three times those of human. 8. The histocompatibility complex is a complex part of DNA that controls the immune response. 9. They have only one Major Histocompatibility Complex, whereas the cancerous cells have both. 10. Major histocompatibility complex ( MHC ) is a genotype found in vertebrates including humans.