1LKI:
reference: The crystal structure and biological function of leukemia inhibitory factor: implications for receptor binding., Robinson RC, Grey LM, Staunton D, Vankelecom H, Vernallis AB, Moreau JF, Stuart DI, Heath JK, Jones EY, Cell 1994 Jul 1;77(7):1101-16. PMID: 8020098

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