Figure 1: Purification of an anticoagulant oligopeptide from Whitmania pigra Whitman. (a) Elution profile of sephadex G-50 chromatography. (b) Elution profile of ion-exchange chromatography. (c) Elution profile of semi-preparative HPLC chromatography. (d) Elution profile of HPLC-purified whitide