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Mean migration speed as a function of age and substrate. Six groups of 10 large plasmodia of different ages (1, 17, 32, 54, 74 and 94 weeks old) were used to conduct this experiment. The substrates were made of oat gel (5% w/v) containing one of two aversive substances (oat + NaCl (0.6% w/v), oat + NaNO3 (0.8% w/v)) or not (oat). N > 48 for each age and each substrate. Total number of assays = 2396. Error bars indicate 95% CI. (Online version in colour.)
