Coadministration of Fuc-S and Ptx, or anti-α₄ and Ptx. Combination treatments of Ptx with Fuc-S (A, B) or anti-α₄ (C, D, E) resulted in different outcomes (enhancement or no enhancement of CFU-C/mL blood), depending on whether the 2 compounds were administered concurrently or sequentially with respect to Ptx injection. Bars represent CFU-C levels after injections of Fuc-S alone (striped), Ptx alone (white), anti-α₄ alone (gray), and combinations (FucS + Ptx or α₄ + Ptx, black). Arrows indicate the time of treatment administration, and times of testing are recorded on the horizontal axis.