title: Component deficiencies. 1. The first component: C1q, C1r, C1s.
mesh_terms: D003166:Complement Activating Enzymes / Q000172:deficiency* / Q000502:physiology; D003172:Complement C1 / Q000096:biosynthesis / Q000172:deficiency* / Q000502:physiology; D015922:Complement C1q; D015923:Complement C1r; D003173:Complement C1s; D005260:Female; D006801:Humans; D008297:Male
chemical_list: D003172:Complement C1; D015922:Complement C1q; D003166:Complement Activating Enzymes; D015923:Complement C1r; D003173:Complement C1s