Electrophoresis conditions: Fused-silica capillary column (effective column length: 48.5 cm, total column length 57.5 cm, outside diameter: 75 μm, internal diameter: 75 μm), background electrolyte: 50 mM borate buffer at pH 8.6 containing 20 mM sodium dodecyl sulfate, voltage: +25 kV, current: 300 μA, column temperature: 25 ± 1 oC, sample injection: 35 mBar - 7s, detection at 237 nm.