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SDS-PAGE electrophoresis (A) and anti-β-Lg Western blotting (B) of the 12 samples of human milk analyzed. Bovine whey proteins (bWP) were loaded as the β-Lg positive control. For the Western blotting analysis, the estimated amount of β-Lg in bWP control was 10 and 1 pg (upper panel) and 100 and 50 pg (lower panel).
