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Comparison of soluble human leucocyte antigen (sHLA) class I level in without acute graft-versus-host disease patients (n = 7) between the first month post-allograft (days 0–30) and the third month post transplantation (days 60–90). sHLA class I level is increased significantly in the third month post allograft [Wilcoxon's matched-pairs test: P < 0·05 (*)].
