Sort criteria and cell purity analysis of adult BM CD19⁺/sIgM⁺ B cells and CD19⁺/sIgM⁻ pre–B cells obtained from the immunomagnetically separated CD34⁻ fraction (A) and CD34⁺/CD19⁺ pro–B cells and CD34⁺/CD19⁻ non–B-lineage progenitor cells obtained from the immunomagnetically separated CD34⁺ fraction (B).