FIGURE 1. Normalized serum time–activity curves of 10 patients expressed as percentage maximum divided by 100. Serum activity shows a biexponential elimination, with half-lives of t1/2(1) = 2.3 ± 1.3 min for the fast component and t1/2(2) = 26.4 ± 14.6 min for the slow component (error bars = 1 SD).