4JOM:
reference: A structural role for the PHP domain in E. coli DNA polymerase III., Barros T, Guenther J, Kelch B, Anaya J, Prabhakar A, O'Donnell M, Kuriyan J, Lamers MH, BMC Struct Biol. 2013 May 14;13:8. doi: 10.1186/1472-6807-13-8. PMID: 23672456

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