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Electrostatic map of the lumen and outer surface of the SipD tip complex. (A and B) Electrostatic potential map of the SipD pentamer. A cut-through view showing the electrostatic surface potential of the lumen is shown in B. (C and D) Electrostatic surface potential map of the needle filament and tip complex. A cut-through view highlighting the differences in the electrostatic properties of the needle filament and tip complex lumen is shown in D.
