Oestradiol crystal. Coloured scanning electron micrograph (SEM) of oestradiol, a female sex hormone made in the ovaries. Oestradiol is a naturally occuring form of oestrogen. It helps regulate the maturation of the female sex characteristics during puberty, and maintains fertility up until the menopause. It can also be given during hormone replacement therapy (HRT) to prevent any adverse symptoms, such as poor memory, hot flushes and anxiety in menopausal women. Magnification: x245 when printed 10 centimetres tall.
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