Detection of human neutrophils in NSG mouse blood. (A) Representative FACS plots showing the distinction of human CD45⁺CD15/66b⁺ neutrophils in the blood (left panel) and BM (right panel) of a NSG mouse transplanted with human Lin⁻ALDH⁺ CB cells. (B) Linear relationship between the dose of Lin⁻ALDH⁺ CB cells transplanted and the level of human neutrophils detected 3 weeks later in the BM. Shown are the mean ± SEM of data pooled from 7 experiments (2-5 mice per cell dose per experiment).