SDS-PAGE electrophoresis performed on the apo-SOD1SH (a) and E,Zn-SOD1SH (b) incubated with MG. Lane 1: control; lane 2: no MG, 5 h; lane 3: 1 mM MG, 5 h; lane 4: 5 mM MG, 5 h; lane 5: 30 mM MG, 5 h; lane 6: no MG, 24 h; lane 7: 1 mM MG, 24 h; lane 8: 5 mM MG, 24 h; lane 9: 30 mM MG, 24 h; lane 10: no MG, 48 h; lane 11: 1 mM MG, 48 h; lane 12: 5 mM MG, 48 h; lane 13: 30 mM MG, 48 h.