For the remaining 6/12 ATMKO T-LBLs (46500, 45190, 48440, 51225, 56211, and 57228), PCR analysis amplified products from all 9 Pten exons that were indistinguishable in size from the corresponding Pten exons amplified from control WT B6 splenocytes and ATMKO B cell lymphoma cells. The gene discussed is PTEN; the disease is B-cell non-Hodgkin lymphoma.