1IWD:
reference: Proposed amino acid sequence and the 1.63 A X-ray crystal structure of a plant cysteine protease, ervatamin B: some insights into the structural basis of its stability and substrate specificity., Biswas S, Chakrabarti C, Kundu S, Jagannadham MV, Dattagupta JK, Proteins 2003 Jun 1;51(4):489-97. PMID: 12784208

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