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