Effect of plasma on LPS priming. Effects of plasma on LPS priming of PMN were assessed using plasma from a single adult (⋅⋅⋅) and a single newborn infant (——) done in triplicate. CL units were determined with luminol as an indicator of oxidative radicals using PMN primed with LPS and plasma (0% to 20%). The priming activity with LPS by itself (▪) or with no LPS (□) are also shown.