Monica, There is an interesting article in "Immunology Today", Feb.1999, vol. 20, No.2, pp 83-88 that describes CD13 being found on early B and T precursors. We see the CD19+/CD13+ phenotype in occasional early B leukemias. It's a nice phenotype for follow-up because of its rarity. Hope this helps. Sincerely, Bruce Greig, Immunopath Lab Vanderbilt Medical Center Nashville, TN
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