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BAL sIL-2Rα (concentration in pg/ml, mean values with s.e.m.) prior to and at the time of obliterative bronchiolitis (OB) (•), compared with matched lung allograft recipients not developing OB (○). The sIL-2Rα concentration preceding OB (calculated as AUC/time) was not markedly different (Wilcoxon's signed-rank test: P = 0·1, n = 7) from that in matched control patients.
