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Fertility Glossary

Follicle

A fluid-filled sac in the ovary containing an egg.

Menstrual cycle & ovulation

Follicles grow during the menstrual cycle in response to FSH.

Also known as: ovarian follicle

Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.

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