Looking at a T Cell, you would not be very impressed. They are average size, and don’t seem special in any way. But they are absolutely indispensable for your survival. People who don’t have enough T Cells, because of a genetic defect, chemotherapy, or a disease like AIDS, have a very high chance of dying from infections and cancers. Sadly, even with the best our modern medicine has to offer, the lives of patients without T Cells often can’t be saved. Because as we will learn in a moment, T Cells are the coordinators of the immune system. They orchestrate others and directly activate your
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