Biology / Bio 0765 · Atom · ~20 seconds
Paracrine Signaling
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Paracrine signaling releases a ligand that diffuses to nearby cells, producing a fast, short-lived, locally concentrated response before enzymes degrade it.
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A wound's nearby cells release paracrine growth factors that trigger local tissue repair without entering the bloodstream.
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A paracrine signal's short range comes from rapid degradation, not from a weak or slow-acting ligand.