Kinetics of recovery of human (CD45/71)⁺, CD34⁺, and CD34⁺ Thy-1⁺ cell populations in CB17/SCID mice between 2 days and 2 weeks after transplantation of 4 × 10⁷ normal light density human bone marrow cells. Values shown represent the mean ± standard error of mean (SEM) of data pooled from two experiments in each of which a group of mice were injected with marrow from a different human donor and then one to three animals per experiment killed for individual analysis at the time points shown.