Which of the following structures has the S configuration? 
Definitions:
Signal Amplification
A process in cellular communication where the number of signaling molecules or their effect is greatly increased, enhancing the response to a signal.
Sodium Ions
Positively charged particles (cations) of sodium, essential for various bodily functions including nerve impulse transmission and muscle contraction.
Ion Channel-linked Receptor
A type of membrane receptor that directly controls the opening of an ion channel upon activation, leading to changes in cell polarization.
Barbiturates
A class of drugs that act as central nervous system depressants, used for their sedative, hypnotic, and anxiolytic properties.
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