Figure 7. Effects of surfactant on cypridina luciferin analog-dependent chemiluminescence (peak) by neutrophils isolated from pulmonary artery. Data are expressed as mean +/- SD. Neutrophils are stimulated by formyl-methionyl-leucil-phenylalanine. Definitions of study groups and symbols of significant difference are shown in the legends of  Figure 1 and Figure 6 , respectively.