1JND:
reference: Crystal structure of imaginal disc growth factor-2. A member of a new family of growth-promoting glycoproteins from Drosophila melanogaster., Varela PF, Llera AS, Mariuzza RA, Tormo J, J Biol Chem 2002 Apr 12;277(15):13229-36. PMID: 11821393

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