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1. Introduction. Collagen is the major structure protein in extracellular matrix (ECM) of various connective tissues, making up 25% - 35% of the whole-body protein content (Sun et al., 2017).Currently, more than 29 types of collagen (type I-XXIX) have been identified, among which type I collagen is the most abundant and present in all vertebrate connective tissues (Sinthusamran et al., 2013).

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