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