More knee joint osteoarthritis (OA) in mice after inactivation of one allele of type II procollagen gene but less OA after lifelong voluntary wheel running exercise - Lapveteläinen, T; Hyttinen, M; Lindblom, J; Långsjö, T K; Sironen, R; Li, S W; Arita, M; Prockop, D J; Puustjärvi, K; Helminen, H J (Osteoarthritis Cartilage, 2001)