1HA8:
reference: NMR structure of the Euplotes raikovi pheromone Er-23 and identification of its five disulfide bonds., Zahn R, Damberger F, Ortenzi C, Luporini P, Wuthrich K, J Mol Biol 2001 Nov 9;313(5):923-31. PMID: 11700049

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