Type IV hypersensitivity involves cytokines being secreted from the Th-I cells, which cause the activation of macrophages and other T cells.
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Type IV hypersensitivity also known as delayed hypersensitivity involves [[Cytokines - WikiBlood|cytokines]] being secreted from the Th-I cells, which cause the activation of [[Macrophages - WikiBlood|macrophages]] and other T cells.