Tissue distribution of ⁵¹Cr vesicles at 30 minutes after injection. The bars represent control rats (▪), rats with preinjection of PC liposomes (□), rats with preinjection of poly-I (▨), and rats with preinjection of PS liposomes (▥). The recovery of the injected dose in the various tissues and blood was for the various groups: controls, 100.0% ± 10.5%; PC liposomes, 107.9% ± 0.2%; poly-I, 98.8% ± 6.3%; and PS liposomes, 90.8% ±0.8%. ^*Significantly different (P = .038) from controls. ^**Significantly different (P < .01) from controls.