Figure 2:
Simplified collagen cross-linking pathways for both enzymatic cross-link and advanced glycation end product (AGE) formation. Immature divalent enzymatic cross-links are simplified to their sodium borohydride reduced forms hydroxylysinonorleucine (HLNL) and dihydroxylysinonorleucine (DHLNL) (Adapted from [63], with permission)
