WARNING: This structure is likely to be fraudulent. See the official statement of the University of Alabama recommending retraction of 1bef, 1cmw, 1df9, 2qid, 1g40, 1g44, 1l6l, 2ou1, 1rid, 1y8e, 2a01, and 2hr0, and the wwPDB statement on Retraction of UAB PDB entries.