ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Computer artwork of the molecular actin myosin muscle structure. The complex ultrastructure of cells, their shape and internal structure and the many motions of cells are supported by filaments of the protein actin (blue structure). It comprises 20% of the protein in muscle cells. Myosin protein (orange structure) is used to transfer energy in cells. Myosin is a molecule-sized muscle that uses chemical energy to perform motions.
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