The studylasted10weeks, and participants did threeone-hoursessionsa week with an instructor. Of the 162 peoplein the study, 81 were in the CBST group and 81 were in the Tai Chi classes.
"They have the sheer power of simple mutations, " says Francis Tally, chief scientist at Cubist Pharmaceuticals (nasdaq: CBST - news - people ) in Lexington, Mass.