LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Calcium ATPase ion pump, molecular model. This enzyme is found in muscle cell membranes, where it pumps calcium in and out of muscle cells and controls muscle contractions. The name ATPase refers to its ability to break up the ATP (adenosine triphosphate) molecule and release energy. This calcium ATPase has 994 amino acids.
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