4.2.1.98 ? x * 42400, SDS-PAGE -, 5945 4.2.1.98 octamer 8 * 42400, the enzyme is functional as tetramer and as octamer, SDS-PAGE -, 5945 4.2.1.98 tetramer 4 * 42400, the enzyme is functional as tetramer and as octamer, SDS-PAGE -, 5945