Leukotrienes are secreted by all except -
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
Macrophages
T4 cells
T8 cells
Platelets
Immunology