AXIN2 (Axin 2) is a gene that encodes a protein involved in the Wnt signaling pathway, which plays a key role in controlling cell growth, differentiation, and development. AXIN2 functions as a negative regulator of this pathway and is important for maintaining normal cellular processes. Mutations in AXIN2 have been linked to cancers, such as colorectal cancer, and developmental conditions like tooth agenesis.