CD34+ thymocytes show variable expression levels of CD1a and CD7. (A) Expression of CD1a in CD34+ enriched thymocytes. (B) The CD34 enriched, lineage-depleted fraction of thymus may be subfractionated into CD34+lin−CD7hi cells, and much rarer CD34+lin−CD7int and CD34+lin−CD7− subpopulations (shown are percentages of each gated population within CD34+lin− cells). (C) Most of the CD34+lin−CD7int population expresses CD10 and CD45. Numbers on plots are percentages of total cells.