1AYI:
reference: A structural comparison of the colicin immunity proteins Im7 and Im9 gives new insights into the molecular determinants of immunity-protein specificity., Dennis CA, Videler H, Pauptit RA, Wallis R, James R, Moore GR, Kleanthous C, Biochem J 1998 Jul 1;333 ( Pt 1):183-91. PMID: 9639578

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