Molecules or proteins released by immune system cells in the region of an injury - infection or other damage to the tissues. They have several effects including dilation (widening) of blood vessels to increase blood supply to the region. They also at

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1. Molecules or proteins released by immune system cells in the region of an injury - infection or other damage to the tissues. They have several effects including dilation (widening) of blood vessels to increase blood supply to the region. They also at