After the entry of an Antigen, what happens?
When an antigen enters the body the APCs like B-cells, macrophages, or dendritic cells come to inspect it. They engulf the antigen digests it into smaller fragments and with the help of MHC molecules present it on their surface where the T cells inspect them and then alert the whole immune system. Then the B-cells as per the epitopes of the antigen design the exact paratope containing antibodies whose job is then to find other such antigens and destroy them. On the other hand, there is another group of B-cells which after the identification of the exact type of antigen will start developing memory cells for that antigen so that in the future if another encounter occurs with the same type of antigen then antibody formation and immune response can be faster.
What is an Antigen?
Antigen is a substance that can trigger an immune response in the body. It is typically a foreign substance, such as a microorganism, a toxin, or a particle, that the immune system recognizes as being “non-self” and potentially harmful. When the immune system encounters an antigen, it produces specific proteins called antibodies that can recognize and neutralize the antigen, or stimulate other immune cells to attack and destroy it
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