Figure 1

Comparison of the intracellular calcium increase ([Ca²⁺]i) in isolated leukocytes after in vitro stimulation with N-formyl-L-methionyl-L-leucyl-L-phenylalanine (fMLP) at different extracellular calcium concentrations with and without citrate. Green, 1 mmol/l EGTA, creating [ecCa²⁺] < 0.025 mmol/L; blue, 0.1 mmol ecCa²⁺/L; red, 4 mmol citrate/L added to a 1.75 mmol ecCa²⁺/L solution; black, 1.75 mmol ecCa²⁺/L. [Heemskerk JW, Feijge MA, Oudemans-van Straaten HM]