Fig. 1. Encapsulation of positively charged, DEAE Sepharose beads by haemocytes in the presence of plasma. (A) Onset of encapsulation (10 min incubation), characterized by attachment of individual haemocytes to beads. (B) End point of encapsulation (2 h incubation), characterized by formation of bead/haemocyte aggregates with large numbers of haemocytes attaching to the beads. Phase-contrast microscopy. Scale bars, 80 mm.