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Macrophage migration inhibitory factor (MIF) levels in the vitreous samples from eyes with grade 1 (n=4), grade 2 (n=19), and grade 3 (n=9) of fibrous proliferation in proliferative diabetic retinopathy (PDR). The horizontal lines indicate the median concentration in each group. Vitreous MIF levels were significantly greater in grade 3 than in grades 1 or 2 (p=0.0076, p=0.0009, respectively).
