Neutrophil extracellular traps
Upon "in vitro" activation with the pharmacological agent phorbol myristate acetate ( PMA ) , Interleukin 8 ( IL-8 ) or lipopolysaccharide ( LPS ) , neutrophils release granule proteins and chromatin to form an extracellular fibril matrix known as NET through an active process . 
<triplet> Interleukin 8 <subj> proteins <obj> instance of