2LET:
reference: An 1H NMR determination of the three-dimensional structures of mirror-image forms of a Leu-5 variant of the trypsin inhibitor from Ecballium elaterium (EETI-II)., Nielsen KJ, Alewood D, Andrews J, Kent SB, Craik DJ, Protein Sci 1994 Feb;3(2):291-302. PMID: 8003965

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