time-course incorporation profiles ( mean silver grains/cell and percentage of cells with at least one cluster of silver grains ) of [ 3h ] -l-lysine and [ 3h ] -d-glucosamine not only reflected the metabolic activities of cell renewal and differentiation in basally-located cells but also the high mucigenic activity in cells near the epidermal surface .
C0007589
differentiation
C0007634
the