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Steroids are a group of lipids that contain a cyclic ring structure called cyclopentanoperhydrophenanthrene. The phenanthrene nucleus consist of three 6-membered carbon rings (A, B, C) and one 5-membered carbon ring(D) fully saturated with hydrogen.

Steroids include:

  1. Cholesterol which is found in the cell membrane of organisms and in the blood.
  2. Steroid hormones- Sex hormones like Testosterone, Estrogens.
  3. Adrenal cortex hormones
  4. Bile acids
  5. Vitamin D