Cooperation of chloroquine and blood platelets in inhibition of polymorphonuclear leukocyte chemiluminescence☆1☆This work was supported in part by grants No. 2/1012/21 (Scientific Grant Agency VEGA), No. 28/2001 (Slovak-Czech Intergovernmental Research-Technical Cooperation).1Abbreviations: CAT, catalase; HRP, horseradish peroxidase; PBS, phosphate-buffered saline; PMNL, polymorphonuclear leukocytes; PRP, platelet rich plasma; SOD, superoxide dismutase.