The expression of
cng-3::GFP was detected from the 2-fold embryonic stage to adult, but was restricted to the head sensory neurons. The five pairs of head neurons bearing GFP signals were the thermosensory neuron, AFD, and the chemosensory neurons, AWB, AWC, ASI, and ASE. The AFD neurons expressed GFP most brightly and the GFP fluorescence was also detected in the ciliated sensory endings of the AFD neurons.