CD14 and myeloid leukemia: In the past years, skin equivalents containing Langerhans cell surrogates derived from CD14+ peripheral blood mononuclear cells (PBMCs)10,11, from cord-blood-derived CD34+ hematopoietic progenitor cells12,13 or from the human myeloid leukemia-derived cell line Mutz-311,14–16 have been reported.