Relative N1m amplitude as a function of glutamine. Linear regression plot of the relative amplitude of the second N1m peak vs. the glutamine/glutamate pool (Glx) (R
2 = 0.26, F(1,13), p = 0.054). The 95% confidence intervals are represented by dashed lines. The insert shows the normal probability plot of the residuals, indicating that the errors are normally distributed. IU, institutional unit.