TLR4 (Toll-Like Receptor 4): TLR4 is a gene that encodes a protein part of the toll-like receptor family, which is critical for the innate immune system. It detects bacterial lipopolysaccharides and plays a vital role in initiating immune responses against pathogens. Dysregulation of TLR4 has been linked to various diseases, including sepsis, atherosclerosis, and autoimmune disorders.