title: Isolation of the C1r sub-unit of the first complement component (C1), avoiding low pH values.
mesh_terms: D002846:Chromatography, Affinity; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003166:Complement Activating Enzymes / Q000302:isolation & purification; D003172:Complement C1 / Q000302:isolation & purification*; D015922:Complement C1q; D015923:Complement C1r; D003173:Complement C1s; D006801:Humans; D006863:Hydrogen-Ion Concentration
chemical_list: D003172:Complement C1; D015922:Complement C1q; D003166:Complement Activating Enzymes; D015923:Complement C1r; D003173:Complement C1s