On the other hand, both VEGF‐expressing populations (SPEC and ALL) produced similar total amounts of rat VEGF (ALL = 109.8 ± 15.8 ng/106 cells/day; SPEC = 83.1 ± 21.1 ng/106 cells/day), in agreement with the fact that the purified SPEC population represents the middle portion of the levels present in the unpurified ALL population, which further comprises both higher and lower ones, as visible on the FACS distribution of fluorescence intensities (Fig. 1A). This evidence concerns the gene VEGFA and acute lymphoblastic leukemia.