Figure 7. Comparison of the phagocytosis ability of retinal pigment epithelium cells cultured onto untreated retinal pigment epithelium-derived extracellular matrix versus nitrite-treated retinal pigment epithelium-derived extracellular matrix. ARPE-19 ingestion of labeled rod outer segments (ROS) is higher on untreated versus nitrite-treated retinal pigment epithelium-derived extracellular matrix (RPE-ECM). Each data point is the average of three experiments with duplicate wells. Background autofluorescence was subtracted.