dehydrogenase (CHD) EC 1.1.99.1 , methanol oxidase (MOX) EC 1.1.3.13 and cellobiose dehydrogenase EC 1.1.99.18 [ 3 ] which share a number of regions of sequence similarities. They contain two conserved protein domains . The N-terminal domain corresponds to the FAD ADP -binding domain, the C-terminal domain is a steroid-biding domain.