Influence of Hb oxygenation on ODQ-induced decrease of cAMP level of RBC from day 11. RBC from day-11 embryos were preequilibrated for 25 minutes before addition of NE (10 μmol/L for 15 minutes) with either air, 1% oxygen, 3% oxygen, or 8% oxygen. After 10 minutes, 30 μmol/L ODQ was added to 1 group of samples. Data are the mean values and SD from 3 to 7 experiments.