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. 2021 Apr 9;11:53. doi: 10.1186/s13568-021-01215-7

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© The Author(s) 2021, corrected publication 2021

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Fig. 7 — Cartoon view of the overall three-dimensional structure of Serratiopeptidase, a ribbon diagram showing the positions of the secondary structure elements was built using online SWISS-MODEL software (https://swissmodel.expasy.org/) and colored according to secondary-structure element. β-Strands are depicted as arrows, the zinc ion is shown by a grey ball, and calcium ions by black balls