Inhibitory effects of SDF-1 or SLF in the upper chamber on MO7e cell migration with SDF-1 and/or SLF in the lower chamber. SDF-1 (100 ng/mL), SLF (10 ng/mL), and/or control medium were added to either the upper or lower chamber as indicated. Significant difference between bars, a and b (P < .01), a and c (P < .02), d and e (P < .002), and d and f (P < .0002).