Leukotriene E4
It is known to be produced by several types of white blood cells , including eosinophils , mast cells , tissue macrophages , and basophils , and recently was also found to be produced by platelets adhering to neutrophils . 
<triplet> white blood cell <subj> eosinophils <obj> has part <subj> basophils <obj> has part <subj> neutrophil <obj> has part