Percentage of labeled threonine and deoxyribose from protein and DNA hydrolysate shows de novo protein and DNA synthesis in non-dividing cells. After 6 hours of pulsing uniformly labeled 13C-glucose, cultures were lysed, and their macromolecules were washed free of latent metabolites and hydrolyzed to monomers. Labeling data are presented as the mean ± standard error of independent biological replicates (n = 3, all pairwise P < 0.02 as determined by one sided Student"s t- 