A chemical that binds to a receptor which consequently triggers a response.
A compound that causes a reversible loss of sensation.
Pain killers that relieve pain without altering sensation.
A chemical that binds to a receptor but does not trigger a biological response.
A segment of a transmembrane protein that extends into the cytoplasm. This segment is often important for translating the extracellular signal into an intracellular message.
A chemical structure formed from two sub-units.
An amino acid and neurotransmitter commonly found in the CNS.
A type of enzyme that transfers phosphate groups from high energy donor molecules, like ATP, to specific substrates.
Endogenous chemical that transmits signals from a neuron to a target cell. Neurotransmitters are ligands of neurotransmitter receptor.
A cocktail of toxins that an animal injects into its victim.
Cell signaling vocabulary