Clodronate Liposomes (Anionic) is a liposome suspension in which clodronate is encapsulated in the aqueous compartments of the anionic liposomes. When animals or cells are treated with Clodronate Liposome, phagocytic cells recognize the liposomes as invading foreign particles and proceed to remove the liposomes from the local tissue or serum via phagocytosis. The liposomes then release clodronate into the cytosol, resulting in cell death. Non-encapsulated clodronate cannot cross the cell membrane to initiate cell death.