Genistein interferes with SDF-1-mediated actin dynamics in resting memory CD4 T cells. (A) Resting memory CD4 T cells from two donors were pretreated with genistein (3.7 μM) or mock-treated for 1 hour at 37°C, and then stimulated with SDF-1 (12.5 nM) for various times, from 0.5 minute to 60 minutes. Cells were fixed, stained with FITC-phalloidin for F-actin, and then analyzed with flow cytometer. (B) Confocal images of cells stained in (A), showing F-actin staining. Images were acquired and analyzed at identical conditions for all samples. Some cells were also stained with DAPI (4′, 6-diamidino-2-phenylindole) for nuclear DNA.