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Telomere length in F1 × spretus backcross mice. Genomic DNA was isolated from spleen cells of adult backcross mice, subjected to restriction digestion, and analyzed by pulse field electrophoresis. (A) Telomere length in (BALB/c × M. spretus)F1 × BALB/c backcross mice. The numbers indicated for F1 and backcross mice identify individual animals. (B) Telomere length in (BALB/c × M. spretus)F1 × M. spretus backcross mice. Numbers identify individual backcross mice.
