AZIN2 (Antizyme Inhibitor 2): AZIN2 is a protein that regulates the activity of ornithine decarboxylase, a key enzyme involved in polyamine biosynthesis. It works by inhibiting antizyme, which normally suppresses ornithine decarboxylase. Polyamines are essential for cell growth and differentiation, and abnormalities in their metabolism—potentially affected by AZIN2—have been associated with cancer because of their role in cell proliferation.