Mean MN1 expression (▪) and range in hematopoietic progenitor and differentiated cells determined by real-time RT-PCR. Sorted cells from G-CSF–mobilized peripheral blood of healthy donors were analyzed for expression levels of MN1 (□) and CD34 (), and mean expression was compared by Student t test (CD34^– and CD34⁺ cell population, n = 4, respectively; CD34⁺/CD38^– cell population, n = 2). Boxes represent interquartile range; error bars, outliers.