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Apoptotic nuclei were not found in retinas treated with growth factors. Vertical sections of the peripheral retina were obtained from eyes that received three consecutive daily doses of insulin alone (a), FGF2 alone (b), or insulin and FGF2 (c). Apoptotic nuclei were not detected at any time (6, 24, or 48 hr) after the final injection of insulin and FGF2.GCL, Ganglion cell layer. Scale bars: b(for a, b), c, 50 μm.
