Chemotaxis of murine thymocytes to chemokines. Freshly isolated thymocytes from 3- to 6-week-old BALB/c mice were assayed for chemotaxis in response to a panel of chemokines. The number of cells migrating was determined by FACS analysis. All assays were performed on samples in triplicate; data shown are representative of three to 5 independent experiments. Significant chemotaxis above background is indicated by *P < .05 or **P < .01.