Effect of growth factor stimulation on the expression of LFA-1 (CD11a) by CD34⁺ cells. Freshly isolated mobilized CD34⁺-selected PBPCs and cytokin-activated (IL-3, IL-6, and SCF for 3 days) mobilized CD34⁺ PBPCs were double stained for CD34 and LFA-1. Data are given for each of five patients studied and are the percentage of CD34⁺ cells that express LFA-1.