Figure 1.

Panel a: Effect of UT-15C (1 µmol/L) on cAMP levels of healthy human (open bars, n = 7) and PAH erythrocytes (RBCs) (filled bars, n = 7). Cells were incubated with UT-15C for 15 min before the reaction was stopped. Values are means ± SE. *Different from respective control (P < 0.05); **different from all other values (P < 0.05). Panel b: Effect of UT-15C (1 µmol/L) on ATP release from healthy human (open bars, n = 15) and PAH erythrocytes (filled bars, n = 13). Values are means ± SE. ^†Different from respective control (P < 0.01); ^‡different from all other values (P < 0.01)