(Top) AA (1 × 10⁻⁵ mol/L) stimulated chemiluminescence response in normoxic, H-R, or SNP (10 nmol/L) pretreated cells in the presence and absence of calcium. (Bottom) Intracellular calcium concentration in the normoxic (C), SNP (S, 10 nmol/L) pretreated, hypoxic (H), and reoxygenated (H-R) PMNLs. Alteration in the cell calcium levels was estimated in absence of Hb (left set) and in the presence of Hb (10 μmol/L, right set). *P < .05 and **P < .01 in comparison with the control.