7010-2006 recognises 17-beta estradiol, a mammalian estrogenic hormone, produced in the ovaries, placenta and testis that has a role in normal sexual development and the regulation of the menstrual cycle. The following cross reactivites have been observed: 17-beta Estradiol 100% 17-beta Estradiol-BSA 90% Estriol <0.9% Testosterone <0.01%