Histopathology neoplastic lesions.

Mentioned n-numbers are tumor bearing animals available for microscopical examination.
k-/-;d-/-: ku80-/-; dna-pkcs−/−.
mes. lm. nd.: mesenterial lymph node.
ax. lm. nd.: axillary lymph node.
*∼5 thymus tumor preparations were microscopically examined per group and found to be all lymphomas. All other macroscopic neoplastic lesions observed in thymus are assumed to be lymphomas as well.
** analyzed in femur.
Tumor incidence based on all animals from longevity cohort, including those not microscopically examined.