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...at involves the accumulation of mutations within the genes that code for [[antibody]]-binding sites. ...meaning to change or vary over time. It was first used in the context of [[influenza]] viruses to describe the phenomenon of small, gradual changes that occur t

...ired immunodeficiency syndrome]] - infection by the human immunodeficiency virus (HIV), which causes a weakening of the immune system * [[Antibody]] - a protein made by white blood cells that reacts with a specific foreign