Progesterone. Molecular model of the steroid hormone progesterone (C21.H30.O2), involved in the female menstrual cycle, pregnancy and embryogenesis. It is an endogenous hormone, produced by the body. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white) and oxygen (red). Illustration.

- Image ID: HACNK9
Progesterone. Molecular model of the steroid hormone progesterone (C21.H30.O2), involved in the female menstrual cycle, pregnancy and embryogenesis. It is an endogenous hormone, produced by the body. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white) and oxygen (red). Illustration.
Science Photo Library / Alamy Stock Photo
Image ID: HACNK9