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…appeared to prevent lung cancer in experimental animals exposed to cigarette smoke. "Broccoli, for example, might contain 100 different isothiocyanate compounds. But what makes watercress unique among the crucifers is that it contains high concentrations of just one compound--phenethyl isothiocyanate, or PEITC," says Richard McAvoy, a professor of plant science at the University of Connecticut. He and a colleague have studied how soil, temperature, harvest stage and other variables affect PEITC levels in watercress. ------------------------------------------------------------------------ **Bibliography**