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. 2003 Dec 11;100(26):15481–15485. doi: 10.1073/pnas.2633596100

Fig. 2.

Fig. 2.

Sequence of left-handed helices turning clockwise at 0.075 Hz, at times t = 102 s, t = 119 s, and t = 146 s. The helices cross, and the crossing point migrates up to the motor, where the helices periodically distort to escape a jam.