Candidate gene analysis. The number of dauer larvae in three npr-1 mutants (alleles DA508, DA609 and DA650), an IL (ewIR081) containing the CB4856 npr-1 allele and N2 in three experiments with increasing dauer numbers are shown (1, 2 and 3). Individual plates are indicated by small white dots, means by large white dots and standard errors by the error bars. Line names shown on the x axis. Letters just above the x axis show the significance group of the IL (A is significantly different from B and B from C, and so on). Significance is shown by the asterisks on the x axis (*P<0.05, **P<0.01, ***P<0.001), denoting isolates that differ from N2.