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The objective of this paper is to assess the possible role of nitric oxide (NO) and leptin in Henoch–Schönlein purpura (HSP). We investigated the serum leptin and total nitrite levels in 22 children with HSP in the acute phase and after remission and in 20 age- and sex-matched healthy control. Serum leptin levels (nanograms per milliliter; median, min–max) were statistically higher in the acute phase...