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Fig. 4. (Top left) Histogram of percentage area of slack membrane taken up before viscous surface tension occurs under passive aspiration (24 cells, mean 5.7%, s.d. 1.5%). (Top right) As for top left but in phagocytosis (20 cells, mean 27%, s.d. 11%). (Bottom left) Histogram of the magnitude of the surface viscosity under passive aspiration (28 cells, mean 72 mN m1 s, s.d. 41 mN m1 s). (Bottom right) As for bottom left but in phagocytosis (15 cells, mean 200 mN m1 s, s.d. 100 mN m1 s).