FIG 2. A and B, Brain proton MRS in a healthy neonate obtained at 4 days of age. Both PRESS (2000/135/250) (A) and STEAM (2000/24/250) (B) proton MRS studies show the peaks of NAA at 2.0 ppm, ß- and -Glx at 2.0 to 2.5 ppm, Cho at 3.2 ppm, (Cr + PCr) at 3.02 and 3.90 ppm, and M-Ino at 3.5 ppm. There is a barely visible peak of -Glx at 3.75 ppm. The peaks of Lac + Lipid at 0.75 to 1.75 ppm are visible on STEAM proton MRS study. NAA indicates N-acetylaspartate; ß- and -Glx, ß- and -CH₂ protons of Glx; Cr + PCr, creatine and phosphocreatine; Cho, choline-containing compounds; M-Ino, myo-inositol; -Glx, -CH protons of Glx; Lac + Lipid, lactate and lipid