Fig. 3.

Peptide diagram of β-casein (a)、αS₁-casein (b)、αS₂-casein (c). The deepening of the green color means an increase in protein abundance. The length of the green line represents the number of peptides at a given location. The horizontal coordinate indicates the position of the peptide sequence. “un”: UHT milk without addition of protease; “0 d, 2 d, 4 d, 6 d”: UHT milk with enzyme stored for 0 days, 2 days, 4 days, 6 days. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)