FIG. 1.

β-Casein sequence (209 amino acids; one-letter amino acid code). Phosphorylated serines are indicated by the letter “U” and highlighted in grey; every 10th amino acid is framed in bold. The 34 initial peptides of the hydrolysate are represented in black rectangles above the β-casein sequence. After 72 h of hydrolysis, nonhydrolyzed peptides were identified by MS-MS and are presented below the sequence with different patterns, depending on the cell extract used: ▥ for L. helveticus ITG LH1, ▧ for L. delbrueckii subsp. lactis ITG LL14, and for S. thermophilus TA 060.