Fig. 1.

Induced cell death in capillaries and the precapillary tertiary arterioles in retinal microvascular complexes exposed for 20 h to various concentrations of H₂O₂. For each point, 10.9 ± 0.5 microvessel-containing coverslips were assayed. *H₂O₂-induced cell death was significantly greater in capillaries than in tertiary arterioles; the P values comparing capillary and arteriolar cell death induced by 3, 5, 8, 10, and 15 μM H₂O₂ were 0.014, 0.007, <0.001, <0.001, and 0.003, respectively.