21.   The researchers cited environmental rather than genetic factors as the probable cause but carefully noted that it remained to be determined whether synthetic estrogens were responsible.

22.   But she stressed that for many women, estrogen is helpful.

23.   Estrogen is a double-edged sword in the health of women.

24.   Estrogen has been found to stimulate breast cell growth, increasing the chances of cancer, Rockhill said.

25.   Estrogen is good at relieving hot flashes but also causes menstrual periods to resume in most women.

26.   He has that found the number of receptors on hippocampal cells fluctuates, depending on how much estrogen is present.

27.   Recent studies suggest that estrogen is ineffective at preventing heart disease, which has many of the same underlying causes as strokes.

28.   The cause of the fall is still disputed but researchers say environmental estrogens are a prime suspect.