Osteoblasts/stromal cells stimulate osteoclast activation through expression of osteoclast differentiation factor/RANKL but not macrophage colony-stimulating factor: receptor activator of NF-kappaB ligand. - Udagawa,N.; Takahashi,N.; Jimi,E.; Matsuzaki,K.; Tsurukai,T.; Itoh,K.; Nakagawa,N.; Yasuda,H.; Goto,M.; Tsuda,E.; Higashio,K.; Gillespie,M.T.; et al. (Bone, 1999)