Final answer:
The subject of this question is Biology and it pertains to the highly polymorphic MHC genes and their proteins. MHC genes encode glycoprotein molecules found on the surface of all nucleated cells, and they play a crucial role in presenting antigens to the immune system.
Step-by-step explanation:
The subject of this question is Biology and it pertains to the highly polymorphic MHC (major histocompatibility complex) genes and their proteins. MHC genes encode glycoprotein molecules found on the surface of all nucleated cells, and they play a crucial role in presenting antigens to the immune system. These MHC genes exhibit significant genetic variation, resulting in proteins that differ by 1-50 amino acid substitutions.