Signal transduction pathway | Cell signaling (article) | Khan Academy
https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/changes-in-signal-transduction-pathways/a/intracellular-signal-transduction
Introduction. Once a signaling molecule (ligand) from one cell has bound to a receptor on another cell, is the signaling process complete? If we're talking about intracellular receptors, which bind their ligand inside of the cell and directly activate genes, the answer may be yes. In most cases, though, the answer is no—not by a long shot!
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