AMPA	α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
ANN	Artificial neural network
CoMFA	Comparative molecular field analysis
CoMSiA	Comparative molecular similarity indices analysis
ECL	Extracellular loop
LOO	Leave-one-out
MLR	Multiple linear regressions
GPCRs	G protein-coupled receptors
ONC	Optimum number of components
PLS	Partial least square
QSAR	Quantitative structure–activity relationship
SEE	Standard error of estimate
SP	Standard precision
TM	Transmembrane helix