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Fig. 5. The variability of pirouette latency within curls and its affect on the
unc-23 model. (A) Pirouette probability by quadrant in real
unc-23 worms. Quadrants I–IV are defined as in
Fig. 4. Total number of
pirouettes was 216. (B) Population behavior of simulated unc-23 worms
that initiate pirouettes according to the probabilities in A. Imposing the
probabilities in A on the model was sufficient to produce spiral tracks with
opposite spiral-bias handedness. Simulated worms had a constant clockwise
turning bias of 7 deg. s–1. Each simulated worm was started
near asterisks and allowed to move for the equivalent of 90 min. The gradient
peak is indicated by intersection of dotted lines. The track of one simulated
worm is highlighted in black; all other tracks are gray (N=50).
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