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Individual microtubules can be visualised by confocal microscopy in reflection mode; when associated with a glass surface, they show up as black lines against the bright reflection from the surface. The high contrast imaging allows details of the behaviour of sliding microtubules to be studied easily. Taxol-stabilised microtubules sliding over kinesin-coated surfaces are normally straight, but can bend into tight loops if the leading end sticks to the surface. Some remain curved after release and move in circles. In such cases, the microtubule lattice must have become stably deformed. Electron microscopy of microtubules fixed during sliding shows no gross rearrangement of the subunit lattice and indicates that microtubule bending is mainly achieved by increased twisting of the longitudinal protofilaments around the microtubule.

The bending of sliding microtubules imaged by confocal light microscopy and negative stain electron microscopy