Table 2.

Sigh responses to hypoxia and hypercapnia before and after microinjection of vehicle into caudal or middle medullary raphe region

	10% O2		7% CO2
	No. of sighs per 1.5 min	Amplitude of sighs, ml	No. of sighs per 4 min	Amplitude of sighs, ml
cMRR (n=5)
Before	3.83±0.53	9.15±0.52	4.05±0.46	8.78±0.81
After	4.08±0.91	8.86±0.85	4.13±0.52	9.05±0.97
mMRR (n=4)
Before	4.01±0.58	9.01±0.82	3.94±0.41	8.83±0.89
After	3.78±0.73	9.26±0.94	4.16±0.63	8.67±0.87

Values are means ± SE for n rats. cMRR, caudal medullary raphe region; mMRR, middle medullary raphe region.