BAG2 and neurodegenerative disease: Bcl2‐associated athanogene 2 (BAG2), a member of the BAG family (comprising BAG1, BAG2, BAG3, BAG4, BAG5, and BAG6), is distinguished by its carboxy‐terminal BAG structural domain.[21] As a multifunctional chaperone protein, BAG2 plays a key role in both cancer and degenerative diseases by regulating the stability and function of target proteins through direct interactions.[22] Evidence indicates that BAG2 is a potent inhibitor of ubiquitin ligase STIP1 homology and U‐box‐containing protein 1 (STUB1).