(GABA A R) subtypes α 1 β 2 γ 2S , α 2 β 2 γ 2S , α 3 β 2 γ 2S , α 5 β 2 γ 2S and α 6 β 2 δ expressed in Xenopus laevis oocytes by use of two-electrode voltage-clamp electrophysiology and compared to those exhibited by the 1,4-benzodiazepine clonazepam. ...