Figure 3a: Main panel: absorbance profiles of SP fractionated by the G2000SW described under “Chromatographic procedures”. Solution buffer contained 5% (thin solid line), 10% (thin dotted line), 20% (thin dash-dotted line), 50% (thick solid line), and 80% (thick dotted line) CH3CN. Insert: detail of the chromatogram at 80% CH3CN between K’ = 0.39 and K’ = 0.80.