25} 20Fr 60 SECTION 5 A—A NOT FED O--0 FED 8HRS AFTER O-:-O FEO 4HRS BEFORE 40 @30 oO ?© 10} ia+ 20 a) a ul) a x . :f SECTION 8 \ : —_ yn WwW 3e oO OD 8 ue ba - Oo SECTION 7 WO 810 oa N fs ud oO cecum 50 (SP ke i 0 — TIME (hours Figure 3. Percent of total 144Ce activity (0.1 uCi) in the last four sections of the G.I, tract of mice on three fasting-feeding regimens as a function of time after oral dose administration. Vertical bars indicate associated standard errors. 641