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Yet more information flows in about the beneficial effects of tea. Scientists in Hunan Province, China have discovered that catechol, or catechin, in tea can lead to cancer cells "committing suicide". The most effective kind of tea is non-fermented green tea but half-fermented (oolong) and wholly-fermented black teas can also kill cancer cells. The effect of different teas has also been found to vary according to its type and growing area. In the USA, scientists from the Medical College of Ohio and the University of Toledo have also demonstrated the anti-cancer effect of epigallocathechin-3 gallate (EGCG), a natural component of green tea. Their studies, however, indicate that black tea does not have the same effect because EGCG is destroyed in its preparation.