1.1.1.105 ? x * 36000, SDS-PAGE 1.1.1.105 ? x * 40000, SDS-PAGE, x * 39900, calculated 1.1.1.105 homodimer 2 * 40000, SDS-PAGE 1.1.1.105 homodimer x-ray crystallography 1.1.1.105 homodimer 2 * 39900, cslculated from amino acid sequence