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Fig. 9. Synapse ultrastructure is normal in unc-119 mutants. Presynaptic specializations are indicated. (A) A GABA neuromuscular junction in the ventral nerve cord of a wild-type adult. (B) A GABA neuromuscular junction in the ventral nerve cord of an unc-119(e2498) adult. (C) An acetylcholine neuromuscular junction in the ventral nerve cord of a wild-type adult. (D) An acetylcholine neuromuscular junction in the ventral nerve cord of an unc-119(e2498) adult. (E) The number of synaptic vesicles per active zone was similar in wild type (black, 262±31.8 vesicles per active zone), unc-119(ed3)(gray, 246±33.0), and unc-119(e2498)(white, 207±39.0). These numbers are not significantly different. Error bars represent standard deviation. Scale bar 10 nm.