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The process of bone resorption by osteoclasts involves the dissolution of mineral salts and enzymatic degradation of the mainly collagenous extracellular matrix. Cysteine proteinases, which can efficiently degrade collagen at acidic pH, have been suggested to play an important role in the bone resorptive process. The cysteine proteinase cathepsin L is secreted by osteoclasts, and inhibitors of this...