TGM2 (Transglutaminase 2): TGM2 is a multifunctional enzyme that catalyzes the cross-linking of glutamine and lysine residues in proteins, a key post-translational modification. It is involved in essential cellular processes such as apoptosis, cell differentiation, and tissue repair by stabilizing and remodeling the extracellular matrix. TGM2 is linked to various disease pathways, including neurodegenerative disorders, fibrotic diseases, and certain cancers, where altered activity can promote disease progression. It also plays a role in immune responses, particularly in celiac disease.