title: [Complement system in the middle ear effusion--low C1 activity and the activation of complement components through the alternative pathway].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003167:Complement Activation; D003172:Complement C1 / Q000032:analysis* / Q000276:immunology; D003170:Complement Pathway, Alternative; D006801:Humans; D008875:Middle Aged; D010034:Otitis Media with Effusion / Q000276:immunology*
chemical_list: D003172:Complement C1