Figure 1.

Telomere repeats in a multigenerational family. Leukocyte DNA was digested with BglII and hybridized with a probe that recognizes the TTAGGG telomeric repeat. Lanes 1–5 contain DNA from umbilical cord of a newborn infant (1), his mother (2), father (3), maternal grandmother (4), and maternal grandfather (5). The wider vertical length in the bands seen in lanes 2–5 reflect greater variability in the length in individual telomeres in the leukocyte populations of adults relative to neonatal PBLs (lane 1).