in order to investigate promoter activity and its modulation by 1,25 ( oh ) 2d3 , plasmids containing the osteocalcin promoter region linked to the reporter enzyme bacterial chloramphenicol acetyltransferase ( cat ) were used to transfect rat osteosarcoma ros 17/2.8 cells , which express osteocalcin endogenously , and umr 106 cells , which lack osteocalcin expression .
C0086860
activity
C0007634
cells