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We demonstrate that N289M or N290M mutation in human GABA(A) beta2 and beta3 subunits increases sensitivity to GABA, which is in contrast to the corresponding rat N265M mutation. Furthermore, the N289M and N289M mutations reduce both the potentiation of GABA-induced currents and the direct effect of propofol on channels incorporating either of the mutated subunits, which confirms earlier findings concerning the corresponding mutation in rat receptors and knock-in mice.

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