Actin trademiling: If the red line represents the plus end and the blue line represents the minus end, then trademiling is a phenomenon that most likely affects actin filaments between locations a and b.
Treadmilling is a process seen in many cellular cytoskeletal filaments, particularly in actin filaments and microtubules. It happens when one end of a filament lengthens while the other end contracts, causing a piece of filament to seem to "move" across a stratum or the cytosol.
Cell mobility is supported by filaments of the cytoskeleton. Microtubules sliding against one another, for instance, causes the movement of cilia and (eukaryotic) flagella. In actuality, structured microtubule arrays may be seen in cross sections of these tail-like cellular extensions.
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