Expression of CD4, CD9, and CD117 on the surfaces of HMC-1 cells and hCB-MCs. (A) Evaluation of the relative number of cells in a typical hCB-MC culture that coexpress CD9 and CD117 (top right quadrant). (B-D) Scattergram analysis of HMC-1 cells. The cells in the indicated windows are the ones that express significant levels of CD4 (B), CD9 (C), and CD117 (D).