[C.elegansII] e404 : sluggish, poor backing, dumpyish; somewhat Egl; multiple defects in neuronal outgrowth, branching; also defects in excretory canal extension, gonad arm growth; males have abnormal bursal anatomy. ES2 ME0. OA>5: n152, n166, n569 (synergizes with sem-5(n177) to give strong Sem migration defect),e2432, e2499, etc. Null phenotype uncertain; some lethality in strong alleles. Cloned: multiple transcripts (different 5' ends); one encodes 1528 aa protein, predicted to bind actin, ATP/GTP; may interact with SEM-5. Transgene overexpression leads to extension of growth cones along a-p axis. [Hedgecock et al. 1987; Hekimi and Kershaw 1993; UG]