title: The first component of human complement--C1.
mesh_terms: D000818:Animals; D003167:Complement Activation; D003172:Complement C1 / Q000032:analysis* / Q000378:metabolism; D006168:Guinea Pigs; D006801:Humans; D011487:Protein Conformation; D013045:Species Specificity
chemical_list: D003172:Complement C1