Retinoid X receptors stimulate and 9-cis retinoic acid inhibits 1,25-dihydroxyvitamin D3-activated expression of the rat osteocalcin gene. - MacDonald,PN.; Dowd,DR.; Nakajima,S.; Galligan,MA.; Reeder,MC.; Haussler,CA.; Ozato,K.; Haussler,MR. (Mol Cell Biol, 1993)