STEVEN MCDOWELL / SCIENCE PHOTO LIBRARY STEVEN MCDOWELL / SCIENCE PHOTO LIBRARY
Animation of a cut-away view of an animal cell membrane. The cell membrane is a complex part of the cell that controls what can get in and out of the cell. The membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of the cell. Shown are the lipid bilayer (purple), transmembrane proteins (large green spheres) with carbohydrate chains (small green spheres) and transmembrane channels (red).
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