confluent , third passage cultures of rat costochondral growth cartilage ( gc ) or resting zone chondrocytes ( rc ) were incubated with 1,25- ( oh ) 2d3 or 24,25-dihydroxyvitamin d3 ( 24,25- ( oh ) 2d3 ) and enzyme specific activity was assayed in the cell layer or in isolated matrix vesicle and plasma membrane fractions .
C0007634
cell
C0007603
plasma membrane