2006j-444 aging analysis apoptosis biochemicalmarkers biochemicaltoxicology biochemistry carcinogenesis cellularcontrolmechanisms chromatin clinicallaboratorytechniques congresses dna dna-ligandinteractions dnarepair dnarepairenzymes environmentalaspects geneticregulation isotopes laboratorymanuals lifesciences methodology microbiologicaltechniques molecularbiology monitoring mutagenesis phosphorus phosphorusradioisotopes physiologic physiology phytochemicals qh465a6442004 qu135 qu25 qu477d62952006 qu58p8571993 research science