3GFV:
reference: Characterization of a Bacillus subtilis transporter for petrobactin, an anthrax stealth siderophore., Zawadzka AM, Kim Y, Maltseva N, Nichiporuk R, Fan Y, Joachimiak A, Raymond KN, Proc Natl Acad Sci U S A. 2009 Dec 22;106(51):21854-9. Epub 2009 Dec 2. PMID: 19955416

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