Intercellular and Intracellular Signaling
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State
Intercellular signaling is communication between cells; intracellular signaling carries a message within one cell, from receptor to acting machinery.
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A hormone traveling from a gland to a distant organ is intercellular; the cascade it triggers inside the target cell is intracellular.
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The two levels connect, not compete — most intercellular signals end by triggering an intracellular one.
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