Fig.5 . Chromatograms obtained with sera from :(A) human;(B) horse; (C) swine; (D) rat; (E) bovine; (F) sheep;and (G) mouse.Peaks: 1=NGNA;2=NANA;3=DMB;4-6=unknown.Column: Radial-Pak C18(5μm;100×8mm I.D.).Mobile phase:methanol-acetonitrile-water(25:4:91,v/v).Flowrate:1.2ml/min.