Superficially wild type on plates. Slight (<10%), but significant, expansion of synaptic vesicles from the synaptic region of the DA9 motor neuron into the flanking asynaptic regions. Synaptic vesicles also showed a slight but significant accumulation in rimb-1 mutant dendrites in the DA9 motor neuron (192 +/- 32% compared to wild type; N=15; P=.015). The sequence GC TAG C TAA A TGA (3 successive stop codons in different reading frames) was inserted after codon 16 of the rimb-1 gene; described in Edwards SL, et al. (manuscript in revision). "Sentryn Acts with a Subset of Active Zone Proteins in the Guided Transport and Capture of Synaptic Vesicles in Caenorhabditis elegans."