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The collagen in Amur sturgeon was extracted by pepsin digestion and separated into two fractions, P2.4 (92.40%) and P4.0 (2.16%), by sodium chloride precipitation. SDS–PAGE and amino acid profile suggested that the P2.4 and P4.0 might be classified as type I collagen (PSC-I) and type V collagen (PSC-V), respectively. These collagens appeared to be dense sheet-like film linked by random-coiled filaments...
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