Collagen Type | Primary Locations | Associated Notes |
Type I | Most common (90%) Bone (osteoblast-derived), skin, tendon, dentin, fascia, cornea, late wound repair | Most common (≈90%). ↓ production in osteogenesis imperfecta type I (B-one) |
Type II | Cartilage (including hyaline), vitreous body, nucleus pulposus | Type II = cartilage (cartwolage) |
Type III | Reticulin—skin, blood vessels, uterus, fetal tissue, granulation tissue | Deficient in vascular type of Ehlers-Danlos syndrome (ThreE D) |
Type IV | Basement membrane, basal lamina, lens | “Under the floor” (Four)—basement membrane. Defective in Alport syndrome; targeted by autoantibodies in Goodpasture syndrome |
Types of collagen
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