title: Alteration of the complement system in children with Henoch Schönlein purpura.
mesh_terms: D002648:Child; D002675:Child, Preschool; D011416:Complement Factor D; D003170:Complement Pathway, Alternative; D003171:Complement Pathway, Classical; D003165:Complement System Proteins; D006801:Humans; D011695:IgA Vasculitis / Q000276:immunology*; D011414:Properdin
chemical_list: D011414:Properdin; D003165:Complement System Proteins; C493488:CFD protein, human; D011416:Complement Factor D