"we measured GFP expression of the gene for C. elegans synaptobrevin (
snb-1), a protein associated with synaptic vesicles, in the tap sensory neurons. SNB-1::GFP was expressed under the control of the
mec-7 promoter that restricts GFP expression to the six mechanosensory neurons of the tap circuit (Nonet, 1999)... The fluorescence we measured appeared as one or two patches in the ventral cord just posterior to the vulva (Nonet, 1999). We measured the total area of the patches in the ventral cords of worms that received distributed training and control worms and found that there was no difference in the amount of SNB-1::GFP expression in the two groups (Fig. 3b)."