6U3U:
reference: Structural and Functional Characterization of Stx2k, a New Subtype of Shiga Toxin 2., Hughes AC, Zhang Y, Bai X, Xiong Y, Wang Y, Yang X, Xu Q, He X, Microorganisms. 2019 Dec 18;8(1). pii: microorganisms8010004. doi:, 10.3390/microorganisms8010004. PMID: 31861375

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