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Estriol Illustration and Icon
Estriol
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A chemical structure diagram depicting the steroid hormone molecule estriol (E3), a tri-hydroxy estrogen. The illustration shows the tetracyclic steroid backbone with three hydroxyl groups attached. In biochemistry and endocrinology, this small molecule functions within the endocrine hierarchy as the predominant estrogen of pregnancy in Homo sapiens (human), produced mainly by the placenta from fetal adrenal precursors, and acts in reproductive tissues by binding estrogen receptors to modulate uterine, mammary, and maternal vascular physiology.
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