rates of reduction in viability and degree of cell killing were relatively independent of concentrations when replicating cultured l1210 cells were exposed to increasing concentrations of 6-thioguanine , 6-methylthiopurine ribonucleoside , 9-beta-d-arabinofuranosyl-9h-purine-6-thiol , or 9-ethyl-6-thiopurine .
C0039902
thioguanine
C0034140
purine