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Levels of (a) oestradiol, (b) oestrone and (c) oestrone sulfate in T. scripta eggs during early embryonic development. Control eggs (0.1 µg oestradiol, filled symbols, n = 17) had lower levels of oestradiol and oestrone, but higher levels of oestone sulfate than eggs treated with bisphenol-A (0.1 µg oestradiol + 40 µg BPA, open symbols, n = 18). Data represent back-transformed means of log-transformed data ±s.e.
