mRNA expression of cell cycle check points and anti-oxidant enzymes in bone marrow cells. mRNA expression on bone marrow cell pellet was determined using q-RT-PCR. Bar chart showing expression of P53, P21, CDK2, CDC25a, SOD1 and SOD2. Wild type (WT) (n = 4), WT+ STZ (n = 4), ataxia telangiectasia mutated (ATM)−/−→WT (n = 5), ATM−/−→WT (n = 5). Statistical Test- One way analysis of variance followed by Student’s Newman Keul Test. Abbreviations: ATM, ataxia telangiectasia mutated; SOD, Superoxide dismutase; STZ, streptozotocin; WT, wild type.