6WZX:
reference: Recognition of nonproline N-terminal residues by the Pro/N-degron pathway., Dong C, Chen SJ, Melnykov A, Weirich S, Sun K, Jeltsch A, Varshavsky A, Min J, Proc Natl Acad Sci U S A. 2020 Jun 8. pii: 2007085117. doi:, 10.1073/pnas.2007085117. PMID: 32513738

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