title: Proceedings: Purification and immunological studies of factors XI and XIa.
mesh_terms: D000818:Animals; D004789:Enzyme Activation; D000939:Epitopes; D005172:Factor XI / Q000276:immunology / Q000302:isolation & purification; D006801:Humans; D009500:Neutralization Tests; D011233:Precipitin Tests; D011817:Rabbits / Q000276:immunology
chemical_list: D000939:Epitopes; D005172:Factor XI