NCIt definition : The hemihydrate form of estradiol, the most potent, naturally produced estrogen. Estradiol
hemihydrate diffuses through the cell membrane and binds to and subsequently activates
the nuclear estrogen receptor found in the reproductive tract, breast, pituitary,
hypothalamus, liver, and bone. The activated complex binds to the estrogen response
element on the DNA and activates the transcription of genes involved in the functioning
of the female reproductive system and secondary sex characteristics.;