highly significantP = 4 × 10 −5
Three-parameter linear/ k th-power regression fits obtained to each combined set of ARE- bla - or ARE- luc -assay response data provided good fits ( R 2 = .99 or .91, respectively, P fit > .99) that each incorporate a highly significant negative initial linear slope ( P = 4 × 10 −5 or .00025) and an overall J-shaped DR pattern.