Effect of oral administration of C. crepidioides (5 g/kg) on serum levels of nitrite (NO
) and nitrate (NO
). (A-C) Serum levels of nitrite (A), nitrate (B) and nitrite plus nitrate (C, D) in C. crepidioides-treated and untreated mice at day 28. (D) Data are mean ± SD of four mice in each group.