. . . . "CF-1 mice following ip-administration;FIGS. 5A and 5B are a graph and bar graph, respectively, which illustrate the transcytosis and accumulation of BBI, BBIssPal(2) and BBIssPal(4) across and into Caco-2 cells; andFIG. 6 is a graph which illustrates the results of Sephadex.RTM. G50 gel filtration analysis of basal medium from Caco-2 cells containing transcytosed BBI, BBIssPal(2) and BBIssPal(4).F" .