Alexander has demonstrated an iodide poroxidase in animal thyroid tissue and believes this enzyme is responsible for the iodination reactions through formation of an oxidized iodinating intermediate.

• Alexander已经证明在动物甲状腺组织中有一种加碘过氧化物酶，并相信该酶对加碘反应起作用，它是通过形成一个氧化态的碘中间体而起作用。