Ordinarily, the liposomes are of the small (about 200-800 Angstroms) unilamellar type in which the lipid content is greater than about 30 mol. percent cholesterol, the selected proportion being adjusted for the optimal therapy. [0215] For parenteral administration, in one embodiment, the polypeptide or other compound is formulated generally by mixing it at the desired degree of purity, in a unit d