Fibrillar collagens are a group of structural proteins that self assemble into a complex ordered structure of interconnected molecules to form supramolecular fibril structures. These collagens have three subgroups based on sequence similarity, of which clade A includes the most abundant fibrillar collagens, types I, II, and III. The fibrous hierarchical structures starts with individual collagen molecules that are crosslinked by enzymes to other collagen molecules to form micro fibrils, which aggregate and link to form sub fibrils, then larger fibrils and in some tissues continuing to assemble into larger levels of fascicles and above.

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