Signal transduction is any process by which a cell converts one kind of signal or stimulus into another. Processes referred to as signal transduction often involve a sequence of biochemical reactions inside the cell, which are carried out by enzymes and linked through second messengers.

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Signal transduction
Adenosine receptors
Apoptosis
Biased ligands
Calcium signaling
Cell cycle regulators
Cytokines
G protein-coupled receptors
G proteins
Gaseous signaling molecules
Growth factors
Hedgehog signaling pathway
Inositol
Intracellular signaling peptides and proteins
Ionotropic receptors
Ligands (biochemistry)
Neurotrophic factors
Opioid receptors
Phospholipids
Programmed cell death
Receptors
Second messenger system
Tor signaling pathway
Transcription factors
Transmembrane receptors
Tyrosine kinase receptors
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