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Fig. 4. GFP-ß2-chimaerin-expressing Jurkat T cells show reduced CXCL12-dependent cell spreading to immobilized VCAM-1. Jurkat T cells were transiently transfected with vectors encoding GFP, GFP-ß2-chimaerin or GFP-ß2-chimaerin plus RacV12. After 24 hours, cells were suspended in HBSS and plated onto VCAM-1-coated slides. Slides were mounted on a 37°C plate and analyzed by confocal microscopy. CXCL12 (200 ng/ml) was added after the first frame and images captured every 10 seconds. Time-lapse confocal recording is shown in Movie 5 in supplementary material. Images are shown at the indicated times to illustrate cell spreading. Bar, 10 µm.