Yale University physician, professor and researcher Hugh Taylor demonstrates how pregnant mice were injected with high doses of the chemical BPA (Bisphenol A) in a laboratory at Yale University in New Haven, Connecticut, May 21, 2010. His research has shown that the chemical alters the way genes react to estrogen, and could open the door for infants in utero to develop cancer much later in life. To match Special Report FOOD/CHEMICALS-CANS REUTERS/Shannon Stapleton (UNITED STATES - Tags: ANIMALS SCI TECH BUSINESS HEALTH)