Biodistribution of liposomes, 2 h and 24 h post-injection. (A) 90:10 DOPE:ST302 liposomes. (B) 90:10 DOPE:ST502 liposomes. Female BALB/c mice were injected i.v. via the tail vein with a single dose of 0.2 ml of [125I]-TI encapsulated DOPE liposomes stabilized with 10 mol % ST302 or ST502. At 2 h and 24 h after injection, mice were euthanized, and blood, various organs, and the carcass were collected and counted for 125I. Standard blood correction factors were applied to correct for blood in organs and carcass. Results are expressed as a percentage of the total counts remaining in the mouse, and are the means of triplicate analyses ± SD.