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Profiles of degradation of the purified αs1-casein (A) and β-casein (B) by L. helveticus strains. The arrows correspond to sites of cleavage by cell envelope proteinases of L. helveticus ITGLH1, ROSELL5088, ITGLH77, and ISLC5 (↑,
); L. helveticus CP790 (45) (
); and L. delbrueckii subsp. lactis CRL581 (20) (↓). Cleavage sites specific to one strain (⇑,
,
) are also shown. U represents a phosphoserine residue.
