Effect of sIL-6R on Mk generation from human CD34⁺ cells in suspension culture in the presence of 100 ng/mL of IL-6 and SCF. 2,000 CB CD34⁺ cells were initiated in the culture and results were examined at day 7. Total Mks generated at each concentration of sIL-6R were calculated based on the proportion of IIbIIIa⁺ cells on cytocentrifuge preparations and total cell number. Results are obtained from three separate experiments. Standard deviations are represented by error bars.