IgM panV_H H CDR3 fingerprinting on human fetal liver and adult B cells. Fingerprinting methodology is identical to that described in the Materials and Methods. Abbreviations: ABM, adult BM; APBMC, adult peripheral blood mononuclear cells; CD10⁻, CD10⁻CD20⁺ mature B-cell population sorted from ABM by FACS; CD10⁺, CD10⁺ CD20⁺ pre-B cells sorted from ABM by FACS; FL, 12-week-old human fetal liver; MW, molecular markers; nt, nucleotides; aa, amino acids. Reprinted with permission from International Immunology, Vol 9, No 10, pp 1503-1515 by permission of Oxford University Press.