title: Factor analysis of the normal electrocardiogram. 2. With special reference to the second-order factors.
mesh_terms: D000818:Animals; D000990:Antithrombin III / Q000032:analysis; D000991:Antithrombins / Q000032:analysis* / Q000302:isolation & purification; D001011:Aorta / Q000032:analysis*; D002417:Cattle; D002807:Chondroitin / Q000032:analysis; D002845:Chromatography; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004586:Electrophoresis; D006025:Glycosaminoglycans / Q000032:analysis; D006497:Heparan Sulfate / Q000032:analysis; D007122:Immunoelectrophoresis; D013917:Thrombin; D014020:Tissue Extracts / Q000494:pharmacology
chemical_list: D000990:Antithrombin III; D000991:Antithrombins; D002807:Chondroitin; D006025:Glycosaminoglycans; D006497:Heparan Sulfate; D013917:Thrombin; D014020:Tissue Extracts