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ICAM-1 expression on HUVEC incubated with (A) serum-free medium alone; (B) sera from children with active HSP; (C) sera from healthy controls; and (D) TNFα (10 ng/ml) for 24 hours. (E) The mean fluorescence intensity of ICAM-1 expression on HUVEC under different stimuli (arbitrary units 0–100). *p<0.001.
