Figure 1.

Stimulation of erythrophagocytosis by internal Ca and autologous serum. RBCs were loaded with 0, 0.5, 7, and 20 μM ionic Ca concentrations in a choline medium without Mg. The extent of phagocytosis (in percent) after incubation without (circles) or with 40% AS (squares) is given as mean values of the number of experiments shown within parenthesis. Vertical bars represent ± 1SD of mean. Collected results from different experiments are given. The curves drawn correspond to linear regression lines, whose determination coefficients (r²) are 0.997 and 0.994 for data from cells incubated with and without serum, respectively.