4.99.1.4 ? x * 20000, SDS-PAGE 730419 4.99.1.4 homodimer - 653297 4.99.1.4 homodimer 2 * 18600, estimated from SDS-PAGE 729160 4.99.1.4 homodimer each monomer is composed of three functional domains, domain structure 649817 4.99.1.4 homodimer three structural domains per monomer, domain structure 644283 4.99.1.4 monomer 1 * 33000, SDS-PAGE -, 649745