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The majority of states have passed laws:
Receptor
A protein molecule that receives chemical signals from outside a cell and, when bound to a specific molecule, can initiate a physiological response.
Neurotransmitter Keys
Molecules that transmit signals across the synaptic gap between neurons in the nervous system, functioning like keys to activate or inhibit neuronal processes.
Locked Door
A door that is secured by a lock, requiring a key, combination, or special mechanism to open.
Receptors
Specialized cells or proteins in the body that respond to specific substances like neurotransmitters or hormones.
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