100.0 MB (2.5 MB compressed)
6827 x 5120 pixels
57.9 x 43.4 cm ⏐ 22.8 x 17.1 in (300dpi)
JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Ecdysterone and testosterone, molecular models. Computer illustration of the structures of testosterone (left) and ecdysterone (right). Ecdysterone (20-hydroxyecdysone or 20E) is a steroid hormone which controls moulting (ecdysis) and development (metamorphosis) in arthropods (e.g. crustaceans). It is synthesised from cholesterol, and can also occur in plants such as spinach. It improves physical performance and muscle mass in humans, which is why it is commonly used as an ingredient in nutritional supplements taken by bodybuilders. Its structure is similar to that of testosterone. Testosterone is the primary male steroid sex hormone, and plays a key role in the development of male reproductive tissues such as the testis and prostate. Like ecdysterone, it also uses cholesterol as a precursor. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), and oxygen (red).
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