17 beta-estradiol inhibits interleukin-6 production by bone marrow- derived stromal cells and osteoblasts in vitro: a potential mechanism for the antiosteoporotic effect of estrogens. - Girasole,G.; Jilka,R.L.; Passeri,G.; Boswell,S.; Boder,G.; Williams,D.C.; Manolagas,S.C. (J Clin Invest, 1992)