3α5βP	5β-pregnan-3α-ol-20-one
c	ratio of the equilibrium dissociation constant in the active state to that in the resting state (a measure of efficacy)
ΔG	free energy change
GABA	γ-aminobutyric acid
GABAA	γ-aminobutyric acid type A
KR	equilibrium dissociation constant of a compound in the resting receptor
NS-1738	N-(5-Cl-2-hydroxyphenyl)-N′-[2-Cl-5-(trifluoromethyl)phenyl]-urea
PA	probability of being in the active state;
PAM	positive allosteric modulator
PAM-2	(E)-3-(furan-2-yl)-N-(p-tolyl)-acrylamide.