3ET9:
reference: Crystal structure of the engineered neutralizing antibody M18 complexed to domain 4 of the anthrax protective antigen., Leysath CE, Monzingo AF, Maynard JA, Barnett J, Georgiou G, Iverson BL, Robertus JD, J Mol Biol. 2009 Apr 3;387(3):680-93. Epub 2009 Feb 10. PMID: 19361425

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