👉 An opsonist is a type of immune system cell that plays a crucial role in recognizing and responding to pathogens. These cells are located within the immune system's "spleen," which is an organ found in the liver and spleen, and they play a critical role in the process of killing or neutralizing harmful bacteria, viruses, and other pathogens. The term "opsonist" comes from the Greek word "oasis." In Greek mythology, a group of gods lived in the