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. 2014 Sep;196(18):3209–3213. doi: 10.1128/JB.02043-14

FIG 2.

FIG 2

Structures of PA, cardiolipin, PG, PPG, PE, and N-acyl-PE in E. coli. Although PA and cardiolipin have a tendency to form bilayers in the absence of divalent cations, these ions tend to be replete in the outer membrane where PA and cardiolipin are thus expected to display non-bilayer properties.