THE IMMUNE SYSTEM AND CANCER
To an observer from outer space the human body might look like an assemblage of 30,000,000,000,000 cells, tiny structures that have a variety of forms and functions. One type of cell, the killer T lymphocyte is a defender. It kills cancer cells and destroys bacteria and viruses that enter our bodies through wounds or breeches in our skin and mucosal barriers. It also constrains the slew of microorganisms that live in our bodies. HIV is a virus that attacks, occupies, and destroys T cells. After the invading virus has substantially reduced the number of body-defenders, a number of organisms “wake up”, reproduce and cause illness and death. When a cell divides, 3 billion pairs of nucleotides separate and become positive and negative individual strands. Each strand is complementary to the other strand. After they part each strand combines with a 3 billion new nucleotides. The process is quite ef...