1CIY:
reference: Bacillus thuringiensis CryIA(a) insecticidal toxin: crystal structure and channel formation., Grochulski P, Masson L, Borisova S, Pusztai-Carey M, Schwartz JL, Brousseau R, Cygler M, J Mol Biol 1995 Dec 1;254(3):447-64. PMID: 7490762

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