👉 Antisera, also known as antibody or immunoglobulin, is a protein that is produced by the immune system to recognize and neutralize an antigen. Antigens are substances that can cause the body to produce an immune response against them. In immunology, antibodies play a crucial role in recognizing and neutralizing pathogens such as viruses, bacteria, and parasites. They bind to antigens on their surface and attach to specific cells or tissues, which leads to the destruction of these pathogens and the