Table 1.

Average number of C-FOS-positive cells in brainstem respiratory areas.

	Normoxia	Hypoxia
MEDULLA
cNTS	16.0 ± 1.7	39.7 ± 8.0*
		P < 0.033
mNTS	35.4 ± 6.4	139.8 ± 17.8**
		P < 0.008
vlNTS	42.8 ± 9.6	130.5 ± 19.9*
		P < 0.011
ROb	153.4 ± 11.7	87.6 ± 21.1
		ns
RPa	107.2 ± 31.6	180.1 ± 44.0
		ns
RMg	21.0 ± 2.0	50.2 ± 6.8*
		P < 0.023
rVLM	38.2 ± 9.7	66.0 ± 16.7
		ns
cVLM	18.6 ± 5.4	81.9 ± 16.4**
		P < 0.002
PP	19.4 ± 7.9	80.6 ± 20.9*
		P < 0.02
RTN/pFRG	12.5 ± 2.1	30.7 ± 7.2*
		P < 0.03
7N	275 ± 8.0	216.6 ± 43.8
		ns
10N	6.7 ± 2.4	23.6 ± 5.7
		ns
12N	182.1 ± 25.5	122.2 ± 11.31*
		P < 0.033
PONS
A5	21.5 ± 6.6	30.3 ± 6.14
		ns
LC	37 ± 7.9	41 ± 9.4
		ns
dSubC	42.6 ± 9.1	170.1 ± 32.3*
		P < 0.048
vSubC	26.4 ± 11.2	56.6 ± 8.5
		ns
mPB	7.4 ± 1.4	46.0 ± 12.7**
		P < 0.008
lPB	6.8 ± 2.1	27.4 ± 6.35 *
		P < 0.037
KF	7.2 ± 2.9	15.8 ± 6.1
		ns

Values presented are total number of c-FOS-positive cells ± S.E.M.

^*P < 0.05, hypoxic values relative to normoxic values.

^**P < 0.01, hypoxic values relative to normoxic values. ns, not significant.

cNTS, commissural part of nucleus of the tractus solitarius; cVLM, caudal part of the ventrolateral reticular nucleus of the medulla; dSubC, dorsal part of the subcoeruleus nucleus; KF, Kölliker fuse nucleus; LC, locus coeruleus; lPB, lateral part of the parabrachial nucleus; mNTS, medial part of nucleus of the tractus solitarius; mPB, medial part of the parabrachial nucleus; PP, parapyramidal group; RMg, nucleus of the raphe magnus; RPa, nucleus of the raphe pallidus; ROb, nucleus of the raphe obscurus; rVLM, rostral part of the ventrolateral reticular nucleus of the medulla; RTN/pFRG, retrotrapezoid/parafacial region; vlNTS, ventrolateral part of nucleus of the solitary tract; vSubC, ventral part of the subcoeruleus nucleus.