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Pavlov, Michael Y; Watts, Richard E; Tan, Zhongping; Cornish, Virginia W; Ehrenberg, Måns; Forster, Anthony C (2010), »Slow peptide bond formation by proline and other N-alkylamino acids in translation«, PNAS, 106 (1): 50–54, doi:10.1073/pnas.0809211106, PMC2629218, PMID19104062.