Table 1.

2° CFC Frequencies Measured at Different Assay Plating Densities

Plating Density (103 per well) 2° CFC Frequency (per 105 cells) N
500  4.2  
250  11.1  4  
 
250  10.7  7  
100  23.3 7  
30  50.2  7  
 
100  34.3  26  
50  44.2 26  
20  63.8  26 
Plating Density (103 per well) 2° CFC Frequency (per 105 cells) N
500  4.2  
250  11.1  4  
 
250  10.7  7  
100  23.3 7  
30  50.2  7  
 
100  34.3  26  
50  44.2 26  
20  63.8  26 

The frequency of 2° CFC (expressed as number per 105MNCs) was measured from 37 BM MNC samples using three to six replicate cultures at each of the shown plating densities in 24-well plates.

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