Rare IL2 dendrite extension defects in dig-1 mutants are enhanced by loss of dyf-7. Heads of (A) wild-type, (B) dyf-7(ns119), (C) dig-1(n1321), and (D) dig-1(n1321); dyf-7(ns119) animals at the L4 stage, showing dendrite extension defects. Arrowheads, dendrite endings. A severely shortened dendrite is boxed and magnified in (C). Animals express klp-6pro:GFP. (E) Quantification of phenotype expressivity. Dendrite lengths were measured as a fraction of the distance from the cell body to the nose tip. Gray bars, individual dendrites; black bars, population mean. n > 90 per genotype except wild-type n = 30. p-values, Mann–Whitney U test with Bonferroni correction.