1LS8:
reference: NMR structure of the unliganded Bombyx mori pheromone-binding protein at physiological pH., Lee D, Damberger FF, Peng G, Horst R, Guntert P, Nikonova L, Leal WS, Wuthrich K, FEBS Lett 2002 Nov 6;531(2):314-8. PMID: 12417333

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