SCIENCE: With Relentless Testing, A Professor Watches His Body Get Sick. “For two-and-a-half years, he’s had regular blood samples drawn, and tracked the ebb and flow of 40,000 different molecules within his cells, from hormones to blood sugar, to the proteins of the immune system and mutated genes. Snyder also watched as his genetic vulnerability to diabetes turned into actual disease. . . . His story marks the first time anyone’s physiology has ever been followed this closely, and portends the future of personalized medicine, according to Snyder and others.”