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John McKenzie - Biography and Images

John McKenzie is medical science correspondent for ABC News based in New York.

McKenzie has covered many of the controversies in medicine, from stem cell research to screening for breast and prostate cancer. His reports on cutting-edge technology have included an implantable microchip to monitor the heart and efforts to grow human body parts in the laboratory. He has highlighted the threat of avian flu, the risks of clinical trials, and common pathology errors in diagnosing cancer.