A strain carrying a
str-2::gfp fusion integrated into chromosome I expresses GFP in just one AWC neuron, with about half of the animals in a population expressing GFP in AWC-left and the other half expressingGFP in AWC-right. No animals express GFP in both AWC neurons. In
sek-1(
km4) mutants,
str-2 was expressed in both AWC neurons.