How does GABA work?

GABA exerts its various effects by binding to GABA_A and GABA_B receptors in the brain. GABA is also found outside the brain in nonneuronal tissues, including the pancreas, certain immune cells (e.g., lymphocytes), and the gastrointestinal tract. How GABA works outside the brain is an area of ongoing research.^{[1][2][3][4][4]}