Numerous substances that the human body does not recognize as its very own can trigger immune system reactions. We refer to these as antigens. The amino acids found on the surfaces of bacteria, fungus, and infectious agents are examples of antigens. Upon binding with certain receptors on immune system cells, these antigens initiate a cascade of physiological reactions. The body typically stores knowledge about the pathogen and how to combat it after coming into proximity to it for the initial time. When it comes into interaction with the bacteria once more, it will immediately recognize it and be able to combat it more quickly.
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