“Genistein inhibited in a noncompetitive manner GABA-activated currents recorded from alpha1beta1gamma2S receptor constructs by reducing the maximum normalized response from 1.83 +/- 0.… +/- 3.9 microM. After mutating the two "functionally active" substrate tyrosine (Y) residues in gamma2S and expressing the mutant receptor alpha1beta1gamma2S(Y365F, Y367F), genistein … GABA ….”