unc-108 (Rab2) mutants have normal numbers of DCVs in their axons. (A) Representative high pressure freezing EM images of wild-type and unc-108(ce365) mutant axons. Open arrowheads indicate DCVs; closed arrowheads indicate presynaptic densities. (B) Summary of DCV statistics in wild-type and unc-108(ce365) mutant axons. Data are means ± SEMs from the indicated sample sizes. The difference in DCV number between wild type and the unc-108 mutant is not statistically significant (P = 0.11; Mann-Whitney test).