OCCUPATION: Professor at the Institute for Integrated Cell-Material Sciences at Kyoto University
NUMBER OF TIME COVERS: 0
PREVIOUS APPEARANCES ON THE TIME 100: 0
PRO: First in mouse cells and then in human ones, Yamanaka (working with James Thomson of the University of Wisconsin) proved that stem cells needn't come from human embryos adult skin cells can be reprogrammed to act like stem cells.
CON: These cells tend to turn cancerous, as cancer-causing retroviruses are used to insert the genes into the cell's chromosomes.
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