- In one storage unit, there are 131, 2 ± 40x107 total nucleated cell, 48, 1 ± 35, 5x105 CD34 cells, the percentage of CD34 cells alive after processing 94, 5 ± 3, 4%, 100% storage stem cell units grow cluster in culture, the number of clusters is diverse and diverse: CFU-GM clusters (48.4 ± 9.8%), CFU-E clusters (48.1 ± 9.5%) 2.