Phagocytosis of normal and deficient nonparasitized (NPE), RPE, and TPE by adherent human monocytes. Parasitized E were fractionated from asynchronous cultures by the Percoll-mannitol method. After opsonization with fresh autologous serum and washings, parasitized E and nonparasitized controls were subjected to phagocytosis. Phagocytosis is expressed as number of ingested cells per monocyte. Mean values ± SD of five separate experiments. Significance of differences between normal and deficient RPE: P = .001; between normal and deficient TPE: P = .229. Significance of differences was assessed by t-test for paired samples.