Fig. 4. Time dependence of D_|| (open squares) and D (closed squares) for several metabolites in abdominal muscle fibers of P. argus. Diffusion was measured using the ³¹P-NMR peak for arginine phosphate (A), and the ¹H-NMR peaks arising from (B) betaine, (C) arginine/arginine phosphate and (D) -CH₂/-CH groups. Values are means ± S.E.M. (N=4, except for -CH₂/-CH peak, where N=3).