Figure 2.
The chemical structure of cholesterol. Note that the α-face of the nucleus (facing down) is "smooth" while the β-face (facing up) is made "rough" by the projection of methyl groups from carbons 10 and 13. Courtesy of Mark E. Duban.
The chemical structure of cholesterol. Note that the α-face of the nucleus (facing down) is "smooth" while the β-face (facing up) is made "rough" by the projection of methyl groups from carbons 10 and 13. Courtesy of Mark E. Duban.