... cultures.Eur J Pharmacol 26 3, 181–185.6 Kameda T, Miyazawa K, Mori Y, Yuasa T, ShiokawaM, Nakamaru Y, Mano H, Hakeda Y, Kameda A &Kumegawa M (1996) Vitamin K2 inhibits osteoclasticbone resorption ... collagen-induced arthritis. MolImaging 4, 1–6. 23 Nakazawa F, Matsuno H, Yudoh K, Katayama R,Sawai T, Uzuki M & Kimura T (20 01) MethotrexateH. Okamoto et al. Anti-arthritis effects of vitamin K 2 FEBS ... K1has a long phytol side chain whereasvitamin K 2 has an unsaturated side chain [1].Vitamin K 2 acts as a cofactor for a vitamin K-dependent carboxylase involved in the carboxylationof coagulation...