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Evaluation of Jurkat cultures in the Boyden chamber assay. Images of microscope fields of the bottom well after 24 h of incubation. (a) Bottom well received no FBS and no test substance; (b) Bottom well received 10% FBS and no test substance; (c) Bottom well received 10% FBS and FTY720 (5 µg/mL); (d) Bottom well received 10% FBS and 13-F10 extract (25 µg/mL). Shrinkage of cells in (c) is indicative of cell death.
