Fig. 4. Pevkinin-2 initiates the pyloric rhythm and elicits slow, rhythmic bursting in a gastric mill motor neuron. (Left) During saline superfusion in the isolated STG, there was no pyloric rhythm (dvn) and the dorsal gastric (DG) neuron was inactive (dgn). Note that the there was ongoing tonic activity in the PY neurons and occasional action potentials in the LP neuron, while the PD neurons were silent. (Right) Superfusion of PevK-2 initiated the pyloric rhythm and elicited rhythmic bursting in the DG neuron. There was no temporal relationship evident between the bursting patterns of the pyloric rhythm and the DG neuron.