Fig. 2

Viability test of tap water samples in Tokyo and different prefectures with an indication of the numbers of faucets examined （A）; and tap water samples obtained from houses in different cities （B）; RSa cells treated with and without bisphenol A by MTT assay （C）. More than five samples in Tokyo and each prefectural area （A） and three water samples in city （B） were collected at different times. The bars represent ±SD.