Effect of clodronate on peritoneal macrophage cell populations. Mice were treated with either 100 μL control liposomes or clodronate liposomes. Ninety hours later, peritoneal cells were harvested by lavage, and macrophage levels were assessed by staining with F4/80 or Mac-1. Results are presented as FACS profiles for unstained cells, normal washout cells, washout cells from a mouse treated with clodronate alone, or a mouse treated with clodronate liposomes.