Leukotrienes are secreted by all except -: (A) Macrophages, (B) T4 cells, (C) T8 cells, (D) Platelets
Answer is D. Leukotrienes are a family of eicosanoid inflammatory mediators produced in leukocytes by the oxidation of arachidonic acid and the essential fatty acid eicosapentanoic acid by the enzyme arachidonate 5-lipoxygenase. As their name implies, leukotrienes were first discovered in leukocytes, but have since been found in other immune cells like macrophages Reff: www.medscape.com