Figure 1.

NK-4 and experimental design. (A) Chemical structure of NK-4. (B) A series of NK-4 working solutions with different concentrations (0.0001 to 0.1 mg/mL). (C) Experimental schedule. (D) Six retinal sites (a, b, c, d, e, and f) for TUNEL staining. The “a”, “b”, and “c” began at the straight distance of 586, 373, and 160 μm, respectively, superior from the optic nerve head, while “f”, “e”, and “d” began at the straight distance of 586, 373, and 160 μm, respectively, inferior from the optic nerve head.