6.3.1.8 ? x * 90000, SDS-PAGE 964 6.3.1.8 dimer 2 * 70000, analytical ultracentrifugation 673330 6.3.1.8 monomer 1 * 86000, SDS-PAGE 649733 6.3.1.8 monomer 1 * 90000, SDS-PAGE 965 6.3.1.8 additional information in vivo a complex between EC 6.3.1.8 and EC 6.3.1.9 exists that persists during purification 964