Abstract
Abstract The spontaneous frequencies of micronucleated reticulocytes (MNRETs) were examined monthly over the life spans of animals beloning to nine mouse strains for the 7th collaborative study organized by the CSGMT/JEMS · MMS. Both sexes of the BDF1 strain and females of the A/J strain showed a statistically significant increase ni mean spontaneous MNRET frequency in their last month of life, suggesting the possibility of strain-specific, age-dependent chromosomal instability. SAMP6/Tan, an accelerated senescence-prone strain, showed the same tendency, although it was not statistically significant. The other strains studied, ddY, CD-1, B6C3F1, SAMR1, and MS/Ae, did not show significant age-related differences in mean of MNRET frequencies. More extensive statistical analyses are underway, and the outcomes will be reported separately.
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