This article has no abstract; the first 100 words appear below.

In a study reported in this issue of the Journal, Townsley et al. found that patients with diseases that are thought to result from defective telomere maintenance benefit from treatment with androgenic anabolic steroids.1 All 12 of the patients they examined had normalization of their leukocyte telomere attrition rate,2 and 11 of the 12 had evidence of telomere elongation instead of telomere loss. These are exciting findings that provide food for thought about the role of telomeres and telomerase in hematopoietic stem cells.The role of telomerase in hematopoietic stem cells has been puzzling ever since the first reports of . . .