4QLB:
reference: Structural basis for the recruitment of glycogen synthase by glycogenin., Zeqiraj E, Tang X, Hunter RW, Garcia-Rocha M, Judd A, Deak M, von Wilamowitz-Moellendorff A, Kurinov I, Guinovart JJ, Tyers M, Sakamoto K, Sicheri F, Proc Natl Acad Sci U S A. 2014 Jun 30. pii: 201402926. PMID: 24982189

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