4D70:
reference: Structural and biochemical analyses of a Clostridium perfringens sortase D transpeptidase., Suryadinata R, Seabrook SA, Adams TE, Nuttall SD, Peat TS, Acta Crystallogr D Biol Crystallogr. 2015 Jul 1;71(Pt 7):1505-13. doi:, 10.1107/S1399004715009219. Epub 2015 Jun 30. PMID: 26143922

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