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SDS-PAGE of soluble protein fractions of tilapia scale gelatin films dehydrated at 120 °C. HMWF: High molecular weight fraction; β: β-chain; α1: α1-chain; α2: α2-chain; S1: 0.6 mol L−1 NaCl; S2: 0.6 mol L−1 NaCl + 1.5 mol L−1 urea; S3: 0.6 mol L−1 NaCl + 8 mol L−1 urea. M: Protein marker
