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Quantitative analysis of the neuroprotective effect of the injected PEDF-secreting NSCs on RGCs is illustrated (n=6). The number of β-tubulin-III-positive RGCs was compared between the eyes injected with PEDF-secreting NSCs and those receiving weekly injections of PEDF 4 weeks after optic nerve crush. *P<0.05; **P<0.01.
