Red cell density profiles. Red cell density profiles in wild-type mice exposed to hypoxia/reoxygenation (close circles; 4 hours D₂₀, 1.098 ± 0.002; 10 hours D₂₀, 1.097 ± 0.003; 46 hours D₂₀, 1.097 ± 0.002 n = 6), SAD mouse groups exposed to hypoxia /reoxygenation (open boxes; 4 hours D₂₀, 1.106 ± 0.001; 10 hours D₂₀, 1.107 ± 0.003; 46 hours D₂₀, 1.111 ± 0.001 n = 6), and SAD mice exposed to hypoxia/reoxygenation plus inhaled NO (open circles; 4 hours D₂₀, 1.104 ± 0.001; 10 hours D₂₀, 1.104 ± 0.002; 46 hours D₂₀, 1.104 ± 0.001; n = 6) compared with normoxia mouse groups (SAD, close triangles, D₂₀, 1.102 ± 0.001; n = 6; wild-type, black asterisk; D₂₀, 1.098 ± 0.001; n = 6). Data are presented as means ± SEMs (n = 6).