In principle, this is what your adaptive immune cells do with gene fragments. It takes gene segments and randomly combines them, then it does the same again, and then it randomly pulls out or adds in parts, to create billions of different receptors. They have three different groups of gene fragments. They randomly choose one from each group and put them together. This is the main course. Then they do this again, but with fewer fragments for the dessert. And then when they are done, they randomly remove or add in parts. This way your adaptive immune cells create at least hundreds of millions of
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