Pleiotropic effects of vitamin D on osteoblast gene expression are related to the proliferative and differentiated state of the bone cell phenotype: dependency upon basal levels of gene expression, duration of exposure, and bone matrix competency in normal rat osteoblast cultures. - Owen,TA.; Aronow,MS.; Barone,LM.; Bettencourt,B.; Stein,GS.; Lian,JB. (Endocrinology, 1991)