4CSH:
reference: Crystal structure of the lytic CHAPK domain of the endolysin LysK from Staphylococcus aureus bacteriophage K., Sanz-Gaitero M, Keary R, Garcia-Doval C, Coffey A, van Raaij MJ, Virol J. 2014 Jul 26;11(1):133. PMID: 25064136

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