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Histogram of peripheral blood mononuclear cell reactive oxygen species (PBMC ROS) level. The histograms in A, B, C, and D represent the geomean of PBMC dichlorofluorescein (DCF) fluorescence as a measure of ROS level among proliferative diabetic retinopathy (PDR), nonproliferative diabetic retinopathy (NPDR), diabetes without retinopathy (DNR), and healthy control (HC) subjects, respectively.
