Introduction: Historical Outline
Collagen is a protein present in the majority of species throughout the animal kingdom, including all vertebrates. It is the most abundant protein of human and other mammalian bodies. It is not a single protein, as thought until the 1970s, and the family of collagen proteins has increased rapidly in recent years due to discoveries of new, genetically distinct types. The biological role of collagens is not limited to supporting the scaffold, rather the function of nearly all systems and organs of the body is related to collagenous structures. On the other hand, the biological functions of collagens should not be considered in isolation since they are constituents of the connective tissue and remain in close mutual relationship with other components of the extracellular matrix.
KeywordsAnimal Kingdom Collagen Molecule Collagen Protein Historical Outline Urinary Hydroxyproline
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