The cytoskeleton
Why?
The cytoskeleton is a network of protein fibres that gives a cell its shape, moves things around inside it and helps it move.
A motor protein walks along a microtubule track like a tiny person carrying a parcel across the cell.
Press the button to watch a motor protein deliver a parcel and a white blood cell crawl.
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A white blood cell crawls towards bacteria by building fibres at its front edge and pulling its back along.
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