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Increase in the frequency of fluorescent reversions with time. Each point and its associated error bars are means ± SEM; data were taken from Table 1. The curve, which was fitted by the program kaleidagraph (Synergy Software, Reading, PA) to the points for days 1–4 only (see text), corresponds to a mutation rate of about 50 per million cells per day or 25 per million cells per generation time.
