4ZM9:
reference: Intramolecular Cleavage of the hASRGL1 Homodimer Occurs in Two Stages., Li W, Irani S, Crutchfield A, Hodge K, Matthews W, Patel P, Zhang YJ, Stone E, Biochemistry. 2016 Feb 16;55(6):960-9. doi: 10.1021/acs.biochem.5b01157. Epub, 2016 Feb 2. PMID: 26780688

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