Before revision:  Using fluorescence, electron, and atomic force microscopies and hydrodynamic theory, we show that TPX2 on the microtubule URLanizes per the Rayleigh-Plateau instability, like dew drops patterning a spider web.
After revision:  Using fluorescence, electron, and atomic force microscopies and hydrodynamic theory, we show that TPX2 on a microtubule URLanizes according to the Rayleigh-Plateau instability, like dew drops patterning a spider web.