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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1 LIVE. 2  Eosin-a counterstain to haematoxylin, this stain colors red blood cells, cytoplasmic material, cell membranes, and extracellular structures pink or red. 3  Ethidium Bromide-this stain colors unhealthy cells in the final stages of apoptosis, or deliberate cell death, fluorescent red-orange.