Helper T-lymphocytes are characterised to release .................

Serotonin

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Histamine

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Pyrogenes

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Cytokines

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Solution

The correct option is D Cytokines
Cytokines are secreted by helper T-cells in response to stimulation by antigens and acts on other cells of the immune system, thereby activating them. Serotonin and histamines are produced by mast cells whereas pyrogens are endotoxins.
Thus, the correct answer is option (D).

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