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a, b and c SDS-PAGE of whey proteins of heat-treated milk for 10 min, 20 min and 30 min respectively. lane M: Marker, lane 1: casein, lane 2: whey protein, lane 3: raw milk, lanes 4 to 8: 65°C, 75°C, 85°C, 95°C and 100°C. d Combination degree of whey protein and casein (10 min (white squares), 20 min (black circles), 30 min (white triangles)).
