Telomere length according to age in patients with dyskeratosis congenita and their relatives. The vertical axis represents telomere length in kilobytes. Lines in the figures indicate the first, tenth, 50th, 90th, and 99th percentiles of results from 400 normal control subjects. Symbols represent subjects: 17 patients with dyskeratosis congenita (red solid circle), 4 Hoyeraal-Hreidarsson variant (green solid triangle), 4 Revesz syndrome (turquoise solid diamond), one silent carrier (blue solid square), and 54 relatives (open square). (Top panels) Granulocytes, lymphocytes, and CD45RA-positive/CD20-negative naive T cells. (Bottom panels) CD45RA-negative memory T cells, CD20-positive B cells, and total leukocytes.