the activity of a beta- ( 1-4 ) -xylan synthetase , a membrane-bound enzymic system , was measured in particulate enzymic preparations ( 1,000 g and 1,000-100,000 g pellets ) obtained from homogenates of cambial cells , differentiating xylem cells and differentiated xylem cells isolated from actively growing trees of sycamore ( acer pseudoplatamus ) and poplar ( populus robusta ) .
C0007589
differentiated
C0007634
cells