1U7G:
reference: Mechanism of ammonia transport by Amt/MEP/Rh: structure of AmtB at 1.35 A., Khademi S, O'Connell J 3rd, Remis J, Robles-Colmenares Y, Miercke LJ, Stroud RM, Science 2004 Sep 10;305(5690):1587-94. PMID: 15361618

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