Progesterone

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Progesterone is a steroidal hormone secreted by the ovaries and also by the placenta. It plays a role in the preparation and development of a pregnancy. Its level is low during the follicular phase and increases during the luteal phase to reach its maximum after ovulation before decreasing at the end of the cycle in the absence of fertilisation. It prepares the uterine lining for implantation of the egg.

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