after labeling with the precursors , 3h-glucosamine and 35so4 , sulfated glycosaminoglycans recoverable by direct proteolysis of the culture monolayers increased approximately 5-fold on a per cell basis from sparsely populated , exponential cell cultures ( greater than 85 % of cells in s , g2 , or m phases ) to stationary cultures inhibited by high cell density ( greater than 50 % of cells in g1 ) .
C0007591
m phases
C0007634
cells