1LTS:
reference: Refined structure of Escherichia coli heat-labile enterotoxin, a close relative of cholera toxin., Sixma TK, Kalk KH, van Zanten BA, Dauter Z, Kingma J, Witholt B, Hol WG, J Mol Biol 1993 Apr 5;230(3):890-918. PMID: 8478941

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