1.21.1.1 ? x * 30000, SDS-PAGE 704417, 726449, 744363 1.21.1.1 ? x * 32800, SDS-PAGE and calculated 704417 1.21.1.1 ? x * 33000, SDS-PAGE and calculated 703608 1.21.1.1 dimer 2 * 22300, SDS-PAGE 704368 1.21.1.1 heterodimer two identical subunits of human IYD form an alphabeta fold, 2 * 30000, recombinant enzyme, SDS-PAGE 734321 1.21.1.1 additional information the enzyme contains three domains: an N-terminal transmembrane region, an intermediate domain, and a catalytic domain 734321