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A, GWC; B, A2 β-casein fraction. a, κ-casein; b, αs-casein; c, β-casein. Retention time is shown in min. The inset image shows the SDS-PAGE gel of the A2 β-casein fraction. M, protein molecular weight marker; GWC, goat whole casein; A2 β-CN, goat A2 β-casein fraction.
