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Microfilaments, also called actin filaments, are protein filaments in the cytoplasm of eukaryotic cells that form part of the cytoskeleton. They are primarily composed of polymers of actin , but are modified by and interact with numerous other proteins in the cell.
Like tubulin, FtsZ forms filaments in the presence of guanosine triphosphate (GTP), but these filaments do not group into tubules. During cell division , FtsZ is the first protein to move to the division site, and is essential for recruiting other proteins that synthesize the new cell wall between the dividing cells.
Actin is a family of globular multi-functional proteins that form microfilaments in the cytoskeleton, and the thin filaments in muscle fibrils.It is found in essentially all eukaryotic cells, where it may be present at a concentration of over 100 μM; its mass is roughly 42 kDa, with a diameter of 4 to 7 nm.
Profilin is an actin-binding protein involved in the dynamic turnover and reconstruction of the actin cytoskeleton. [1] It is found in most eukaryotic organisms. Profilin is important for spatially and temporally controlled growth of actin microfilaments, which is an essential process in cellular locomotion and cell shape changes.
Beka Setzer, an Ohio mother of two young daughters, took to Facebook last summer to share shocking photos of her daughter Emmalee's legs after a day spent playing outside went awry. "PSA," she wrote.
Researchers have produced the first ever 3D prints of images contained in dolphin echolocation -- including how humans look like underwater.
Black widows make irregular or asymmetric webs, Medline Plus says, and the spiders can bite people when humans bump into their webs. The spiders also typically stay within a few feet of ground level.