Fig. 15.

The cells bearing putative vasculogenic and hematopoietic progenitor markers are numerous in 12.5 dpc hearts. Flow cytometric analysis of CD41 and Flk1 double-positive cells. Cells isolated from hearts (a) or blood samples (b) were stained with anti-CD41-PE and anti-Flk1-APC antibodies. The rectangular gate marks a population of CD41/Flk1 double-positive cells isolated from hearts (a). This population is not present in blood samples (b). The mean population frequency obtained from six experiments is shown ± standard deviation