a, Intracellular PiCo recordings in Vglut2-cre;Ai27
(n=3) and Chat-cre;Ai27 (n=5) horizontal
slices. Photo-stimulation after TTX depolarizes membrane potential.
b, PiCo, preBötC in progressive synaptic block
(n=5). Rhythms synchronized in gabazine, bursting abolished in CNQX.
c, PiCo cell in Dbx1-cre;Ai27 horizontal slice
with progressive synaptic block. PiCo cell inhibited during photo-evoked
inspiratory burst in NE/strychnine, bursts with light-stimulation in gabazine,
ceases bursting in CNQX (500 ms light, 40 sweeps, n=4). d,
PiCo bursting eliminated by 25 nM DAMGO; representative bursts (n=5).
e, PiCo inhibited by 500 nM SST; representative bursts
(n=6).