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Comparison of netrin-1 levels between PDR and non-PDR patients. A: vitreous netrin-1 levels between PDR and non-PDR patients. B: average netrin-1 levels in the vitreous and the serum of PDR and non-PDR patients. Vitreous netrin-1 level was significantly higher in PDR patients (P<0.001). However, no significant elevation in serum netrin-1 level in PDR patients was observed (P>0.05).
