Mean (M) and standard error of the mean (SEM) of amino acid concentrations in plasma.

ASP: aspartate, GLU: glutamate, HPRO: hydroxyproline, ASN: asparagine, SER: serine, GLN: glutamine, GLY: glycine, HIS: histidine, ARG: arginine, TAU: taurine, THR: threonine, ALA: alanine, PRO: proline, TYR: tyrosin, VAL: valine, MET: methionine, CYS: cysteine, ILE: isoleucine, LEU: leucine, PHE: phenylalanine, TRP: tryptophan, LYS: lysine. Taurine and their precursors (MET and CYS) amino acids are bolded. The AIN93-G WP and WPH diet was made by substituting the casein (CAS, n = 8) for whey protein (WP, n = 8) or whey protein hydrolysate (WPH, n = 8). Different superscript letters indicate significant differences between groups, ANOVA was used and means were compared (Duncan test), adopting the value of p<0.05 as a criterion for statistical significance. Number in parenthesis following each amino acid is the corresponding retention time in minutes.