IL-6 mediates the effects of IL-1 or TNF, but not PTHrP or 1,25(OH)2D3, on osteoclast-like cell formation in normal human bone marrow cultures - Devlin, R D; Reddy, S V; Savino, R; Ciliberto, G; Roodman, G D (J Bone Miner Res, 1998)