1GNC:
reference: Structure and dynamics of the human granulocyte colony-stimulating factor determined by NMR spectroscopy. Loop mobility in a four-helix-bundle protein., Zink T, Ross A, Luers K, Cieslar C, Rudolph R, Holak TA, Biochemistry 1994 Jul 19;33(28):8453-63. PMID: 7518249

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