The female breast contains cells called estrogen receptors which are stimulated by the presence of estrogen (or xeno - estrogens) into producing more mammary tissue. (thefashionablehousewife.com)
Researchers now think that in female animals, the presence of estrogen promotes female development at specific life stages, and having a second X chromosome makes female brains different from those of males. (discovermagazine.com)
The sensor sends an electronic signal is the presence of estrogen and, with further development, could test estrogen levels in bodily fluids or test waterways for estrogen contamination that might pose a risk to humans and the environment. (sciencedaily.com)