The uptake rate of 65Zn in each tissue (a) and in the blood (b) at 4 h after an intravenous administration of di(1-oxy-2-pyridinethiolato)Zn ([65Zn(opt)2]), 65ZnCl2, or di(l-histidinato)Zn ([65Zn(His)2]). Data are expressed as mean values±SD for four mice. For the statistical evaluation, one-way analysis of variance with Bonferroni's test was used. *P<0.05, **P<0.01, ***P<0.001 versus [65Zn(opt)2]. %ID, percent injected dose.