GABA_B receptors are unusual because unlike other metabotropic receptors, they A) require glycine as a co-agonist. B) require two different subunits to work properly. C) simultaneously enhance Na⁺ channel opening and inhibit cAMP. D) act as autoreceptors.

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GABA_B receptors are unusual because they are obligate heterodimers, meaning they require two different subunits (GABA_B1 and GABA_B2) to function properly.

GABAB Receptors Are Unusual Because Unlike Other Metabotropic Receptors, They

GABA_B Receptors Are Unusual Because Unlike Other Metabotropic Receptors, They