Kazuo Okamoto1,2,3) and Hiroshi Takayanagi *,1,2,3,4) 1)Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan 2)Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone Diseases, Tokyo, Japan 3)Japan Science and Technology Agency (JST), ERATO, Takayanagi Osteonetwor...