Atlas One · Host Biology · Scale 03 — Molecular

Estrogen

C18 steroid from ovarian granulosa cells via CYP19A1; 17β-estradiol (E2) is the principal form; binds ERα/ERβ → reproductive cyclicity, bone density, serotonin modulation, and neuroprotection; estrogen deficiency causes osteoporosis; ERα drives ~70% of breast cancers.

Also known as: 17β-estradiol, E2, estradiol, oestrogen, estrone, estriol, ERα, ERβ, estrogen receptor, aromatase substrate

Scale 03 — MolecularScale
draftStatus
2026-06-08Last Reviewed
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estrogen

Estrogen

C18 steroid from ovarian granulosa cells via CYP19A1; 17β-estradiol (E2) is the principal form; binds ERα/ERβ → reproductive cyclicity, bone density, serotonin modulation, and neuroprotection; estrogen deficiency causes osteoporosis; ERα drives ~70% of breast cancers.