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Increased type II collagen cleavage by cathepsin K and collagenase activities with aging and osteoarthritis in human articular cartilage

Valeria M Dejica, John S Mort*, Sheila Laverty, John Antoniou, David J Zukor, Michael Tanzer and A Robin Poole

Arthritis Research & Therapy 2012, 14:R113  doi:10.1186/ar3839