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If you want a shorter version, but with some key terminology in there, here you go: When the body is exposed to an antigen (a substance that stimulates an immune response), antigen-presenting cells (e.g. macrophages) engulf them and present them on the surface of their cell membrane. Then, T cells bind to it and in short, they eventually get activated. Then ...


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Human Immunodeficiency Virus is a mutated form of Simian Immunodeficiency Virus. In simians (Apes and Monkeys, not including humans), SIV is not pathogenic, in most cases, however, when the mutated form made the jump to humans, it became highly contagious and virulent. You can find a basic description in the wikipedia article here: Simian Immunodeficiency ...



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