Figure 1: Effect of various concentrations (1, 2.5 or 5 nM) of N,N,N,Ntetrakis-( 2-pyridylmethyl) ethylenediamine (TPEN) in vivo on zinc levels in rat retina after intraocular injection: A) 3, B) 5 and C) 10 days. Each value is the mean ± SEM, n = 6. * p < 0.05 with respect to dimethyl sulfoxide, DMSO (vehicle, control group). At 5 days after the io administration of TPEN in a concentration of 5 nM with respect to DMSO (F3,20 = 9.39) P < 0.05 At 3 and 10 days, TPEN compared to DMSO (F3,20 = 1.79 P > 0.05 and F3,20 = 1.401 P > 0.05, respectively).