Mon Mar 19, 2007 12:15PM EDT

By Julie Steenhuysen
CHICAGO (Reuters) - At least 70 percent of all new drugs introduced in the United States in the past 25 years come from nature despite the use of sophisticated techniques to design products in the lab, researchers reported on Monday.
Their study indicates that a back-to-nature approach might yield better possibilities for companies looking for the next blockbuster drug. Full story...