Figure 1. Detectable levels of S100A4 (panel A), osteopontin (OPN; panel B), soluble syndecan-1 (panel C), and vascular endothelial growth factor (VEGF; panel D) in vitreous samples from eyes with proliferative diabetic retinopathy (PDR) and rhegmatogenous retinal detachment (RD). The dashed line represents the detection limit (9 pg/ml) of the assay for VEGF (panel D). The mean levels are indicated by horizontal solid lines.