Fig. 3From: Development of a simple method for the analysis of phenylalanine in dried blood spot using tandem mass spectrometryCalibration curve for estimating phenylalanine concentration in dried blood spots. The shaded area between the lower and upper dotted lines represents the 95% CI of the curve, showing the equation and coefficient of determination (r2). Slope and Y intercept are reported as mean ± SEBack to article page