Indophenol-oxidase in patients with Down's syndrome due to simple trisomy and to translocation 21/22

The indophenol-oxidase of erythrocytes was studied in three groups (trisomy G 21, unbalanced translocation 21/22, and control group). The increase of IPO activity in patients with trisomy G 21 was observed, whereas in those with unbalanced translocation 21/22 the levels of IPO were slightly lower than in control group.