HLA-A (Human Leukocyte Antigen A): HLA-A is part of the MHC class I molecules, essential for presenting peptide antigens to the immune system, particularly to CD8+ T cells. It plays a crucial role in the body's defense against pathogens and in tumor surveillance. Variations in HLA-A alleles can influence susceptibility to infectious diseases, autoimmune disorders, and transplant rejection. The specificity of HLA-A in antigen presentation underscores its significance in immune regulation and its potential as a target for immunotherapeutic strategies....