UTMB researchers have used new techniques to study exposure to low doses of multiple xenoestrogens. And they've come to some disturbing conclusions. Using cell cultures to test mixtures of three compounds known to affect estrogen signaling — bisphenol A, bisphenol S and nonylphenol — the scientists determined that combinations of endocrine disruptors could have a dramatically greater effect than any one of them alone. The news also appears in Medical News Today.