Figure 5. Simultaneous expression of the neurotransmitter GABA (A) and an
unc-55-gfp reporter (B) in the nervous system of an L2 Stage C. elegans. 1, Cell bodies that colocalize GABA and the
unc-55-gfp reporter; these are the VD motor neurons. 2, Locations of cell bodies that express GABA but not the
unc-55-gfp reporter; these are the DD motor neurons. 3, Locations of cell bodies that express the
unc-55-gfp reporter but not GABA; these have been identified tentatively as AS motor neurons. Criteria for motor neuron identification are described in Results. Anterior is to the left. Scale bar, 20 μm.