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2. Hydroxyproline - Wikipedia

   en.wikipedia.org/wiki/Hydroxyproline

   Hydroxyproline is a major component of the protein collagen, [3] comprising roughly 13.5% of mammalian collagen. Hydroxyproline and proline play key roles for collagen stability. [4] They permit the sharp twisting of the collagen helix. [5]

3. The 10 Best Plant-based Collagen Powders and Boosters for ...

   www.aol.com/lifestyle/10-best-plant-based...

   Since collagen production naturally declines as we age and is also weakened by everyday exposure to pollutants and free radicals, replenishing it naturally with an organic or vegan collagen ...

4. Prolidase deficiency - Wikipedia

   en.wikipedia.org/wiki/Prolidase_deficiency

   Collagen is a structural protein found i.a. in bone, skin and connective tissues that is broken down into iminodipeptides at the end of its lifecycle. Of these dipeptides, those containing C-terminal proline or hydroxyproline would normally be broken down further by the enzyme Prolidase, recovering and thus recycling the constituent amino acids.

5. Collagen - Wikipedia

   en.wikipedia.org/wiki/Collagen

   Proline makes up about 17% of collagen. Collagen contains two unusual derivative amino acids not directly inserted during translation. These amino acids are found at specific locations relative to glycine and are modified post-translationally by different enzymes, both of which require vitamin C as a cofactor. Hydroxyproline derived from proline

6. The best skin care routine for your 50s, according to ... - AOL

   www.aol.com/lifestyle/best-skin-care-routine-for...

   "Retinoids are potent anti-aging ingredients that increase cell turnover, boost collagen production, and help reduce the appearance of wrinkles and age spots," while the peptides "help in building ...

7. Collagen helix - Wikipedia

   en.wikipedia.org/wiki/Collagen_helix

   In 1954, Ramachandran & Kartha (13, 14) advanced a structure for the collagen triple helix on the basis of fiber diffraction data. It consists of a triple helix made of the repetitious amino acid sequence glycine-X-Y, where X and Y are frequently proline or hydroxyproline. [2] [3] Collagen folded into a triple helix is known as tropocollagen.