title: Natural antibodies in mammalian sera to folinic acid and methotrexate.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D003168:Complement Fixation Tests; D003429:Cross Reactions; D004306:Dose-Response Relationship, Immunologic; D006168:Guinea Pigs; D006462:Hemolytic Plaque Technique; D006801:Humans; D007075:Immunoglobulin M / Q000096:biosynthesis*; D002955:Leucovorin / Q000276:immunology*; D008727:Methotrexate / Q000276:immunology*; D011817:Rabbits; D051381:Rats
chemical_list: D007075:Immunoglobulin M; D002955:Leucovorin; D008727:Methotrexate