Combined effects of SDF-1 and SLF on MO7e cells. Migration of cells into the lower chamber after (A) SLF(10 ng/mL) and/or SDF-1 (100 ng/mL) were added to the lower chamber, or (B) SDF-1 and/or SLF were added to the lower chamber in combination at different concentrations (shown in ng/mL). *Significant difference from the second or third bar to the left, P < .05.