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Pharyngeal pumping of daf-2 and daf-18 mutant worms on food. Class II, strong, daf-2 mutations daf-2(e1370) (n = 12) and daf-2(e979) (n = 7) pump less well than N2 animals (n = 25) on food. The weak mutation daf-2(m577) (n = 17) and mutation in daf-18(nr2037) (n = 18) pump at >90 % of the rate shown by wild-type animals. Error bars represent standard error of the mean (s.e.m); asterisks mark comparisons different to wild-type N2 at ***p < 0.001 by one-way ANOVA with Bonferroni post-test
