HLA-C (Human Leukocyte Antigen C): HLA-C is a gene that encodes a protein belonging to the MHC class I family, which plays a vital role in the immune system by presenting peptide antigens to CD8+ T cells. It also helps regulate natural killer (NK) cell activity through interactions with KIR receptors. The expression and diversity of HLA-C influence immune response effectiveness, impacting susceptibility to infections, autoimmune diseases, and transplantation outcomes.