Adhesion molecule expression by BM CD34⁺cells fractionated on the basis of cell-cycle status. CD34⁺ cells enriched from BM cells were stained with control antibodies (middle) or with MoAbs (bottom) against VLA-4 (right), VLA-5 (middle), or LFA-1 (left) and then subjected to cell-cycle analysis. The expression intensities of the adhesion molecules of CD34⁺ cells fractionated on the basis of cell-cycle status are presented. (Solid line) CD34⁺ cells in S + G₂/M phase; (broken line) CD34⁺cells in G₀/G₁ phase.