“…The particulate and colloidal preparations studied include bacteria (23), fat droplets (82), albumin-globulin complexes and saccharated iron oxide particles (15), colloidal chromium phosphate particles (43), and carbon particles (20). In many cases, the cleared material has been identified in macrophages (17,82,119). A number of factors have been shown to influence the rate of clearance, and these were first studied quantitatively by Benacerraf and his collaborators.…”