Part of the problem with the discovery of the so-called breast-cancer genes was that physicians wrongly told women that had the genetic changes associated with the genes that they had a 99% chance of getting breast cancer. Turns out all women that have these genetic changes don't get breast cancer.
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About Craig Venter
Craig Venter was a contemporary American scientist. John Craig Venter is an American scientist. He is known for leading one of the first draft sequences of the human genome and led the first team to transfect a cell with a synthetic chromosome. Read more on Wikipedia →