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. 1997 Jul 14;138(1):105–117. doi: 10.1083/jcb.138.1.105

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UV cutting of self-assembled microtubules. Microbeam irradiation of free microtubules produces two severed ends: typically one shortens, the other is stable. The microtubule shown extended out of the field of view for over 100 μm in either direction. The microbeam area is indicated by the circle. After irradiation, the severed end on the right is stable, and the severed end on the left shortened toward the left edge of the field through the observed time. Bar, 5 μm.