Figure 4

Reversals of the wild type and deletion strains as measured by computer-based cell-tracking. The percent reversal in a 4 second interval was determined either without stimulation (spontaneous, gray bar), after a blue light pulse (blue bar), or after a step down in orange light (orange bar). Error bars represent the 95% confidence interval. The dashed line indicates the estimated maximal tracking error of 5%. Two clones of each deletion strain were measured, except for R1Δ4 and R1Δ2–4.