Microtubules polymerized in H2O-Head Splitting
mediaposted on 30.12.2011 by Andy Maloney, Pranav Rathi
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Keep eye on the white circle, micro-tubules splits into two. Just before splitting the tubule curled in a shape sideways. The head part of tubule is stuck; the lower curled part moves to the left, because the lower part is still pushing it. It looks like to me that tubule are elastic but at tight turns/curls (Over few number of protofilaments), they are pretty rigid like a rod and easily break. I think this is what happened here; it took a tight turn/curl and the bond between one protofilament circle and next, breaks, though the break does not have to be shapely between the circles it can have any arbitrary forms.