Fig. 7. Morphological abnormality of the ASER neuron in the ncr-2; ncr-1 mutant. (A) GFP labeled wild-type and mutant ASER neurons. The wild-type ASER neuron (top panel) consists of a cell body (c), a dendritic process (d) to the amphid sensory organ in the nose, and an axon process (a) to the nerve ring. The bottom panel shows the morphology of an ASER neuron of the ncr-2; ncr-1 mutant at the dauer stage. The mutant neuron sends out an ectopic posterior process (epp), often terminating in one or more swellings. (B) The morphological defect of the ASER neuron in ncr-2; ncr-1 mutant is transient and associated with the dauer stage. The percent value of each morphological class is reported.