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Neidhart, M; Baraliakos, X; Seemayer, C; Zelder, C; Gay, R E; Michel, B A; Boehm, H; Gay, S; Braun, J (2009). Expression of cathepsin K and MMP-1 indicate persistent osteodestruktive activity in longstanding ankylosing spondylitis. Annals of the Rheumatic Diseases, 68(8):1334-1339.