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. 2021 Jan 7;21:22. doi: 10.1186/s12887-020-02481-3

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© The Author(s) 2021

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Fig. 3 — Structural homology of the Cys551Tyr and Leu254Ser. a Molecular model of Cys551Tyr. Noted loss of the disulfide bond between Cys534 and Cys551 and additional hydrogen bond formation between Cys534 and Thr530. b Homological model of Leu254Ser, indicating one additional hydrogen bond forming between Ser254 and Phe251