SIGRID GOMBERT / SCIENCE PHOTO LIBRARY SIGRID GOMBERT / SCIENCE PHOTO LIBRARY
Cell membrane. Cutaway computer artwork of section through a cell membrane. The cell membrane is composed of a double layer (bilayer) of phospholipids (blue and yellow) and controls what can get in and out of the cell. It is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells through protein channels (centre, yellow) that span both layers.
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