Cell sorting experiments of SLAM (CD150⁺CD48⁻) and non-SLAM (not CD150⁺CD48⁻) populations. Human G-CSF MPB CD34⁺ cells (A) and CD34⁻ cells (B). Human UCB CD34⁺ cells (C) and CD34⁻ cells (D). Human BM CD34⁺ cells (E) and CD34⁻ cells (F). Rhesus macaque MPB CD34⁺ cells (G) and CD34⁻ cells (H). No significant numbers of SLAM cells are detected in the CD34⁻ population from any hematopoietic source.