GHK Cu Peptidos JCI 11 Hydroxysteroid dehydrogenase blockade prevents age induced skin structure and function defects Full article: Enzymatic cross linking of collagens in organ fibrosis resolution and assessment Glycation of type I collagen selectively targets the same helical domain lysine sites as lysyl oxidasemediated cross linking Journal of Biological Chemistry Targeting lysyl oxidase like 2 (LOXL2) inhibits collagen cross linking and accelerates reversal of pre established liver fibrosis