5KHN:
reference: Crystal structures of the Burkholderia multivorans hopanoid transporter HpnN., Kumar N, Su CC, Chou TH, Radhakrishnan A, Delmar JA, Rajashankar KR, Yu EW, Proc Natl Acad Sci U S A. 2017 Jun 20;114(25):6557-6562. doi:, 10.1073/pnas.1619660114. Epub 2017 Jun 5. PMID: 28584102

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