actin one of the proteins into which actomyosin can be split can exist in either a globular or a fibrous form actomyosin a protein complex in muscle fibers composed of myosin and actin shortens when stimulated and causes muscle contractions
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Grayscale is a range of shades of gray without apparent color. The darkest possible shade is black, which is the total absence of transmitted or reflected light. The lightest possible shade is white, the total transmission or reflection of light at all visible wavelength s.