4RWR:
reference: Crystal structures of the SpoIID lytic transglycosylases essential for bacterial sporulation., Nocadello S, Minasov G, Shuvalova LS, Dubrovska I, Sabini E, Anderson WF, J Biol Chem. 2016 May 18. pii: jbc.M116.729749. PMID: 27226615

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