1RJ1:
reference: The invertase inhibitor Nt-CIF from tobacco: a highly thermostable four-helix bundle with an unusual N-terminal extension., Hothorn M, D'Angelo I, Marquez JA, Greiner S, Scheffzek K, J Mol Biol 2004 Jan 23;335(4):987-95. PMID: 14698293

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