Um exchange and lysis by osmotic shock, the cells on the cover glass were fixed with 2 paraformaldehyde and stained with Diff-Quik stain. The percentage of ZK cells which phagocytosed SRBC was scored by light microscopy. Cells were deemed positive for phagocytosis if they ingested more than five SRBC. Cells uptake of unopsonized SRBC and cells without lysis were used as controls.Binding/phagocyto