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Native FT-ICR mass spectrum of ID-EncFtn. Native nanoelectrospray ionization mass spectra of apo-ID-EncFtn (A), ID-EncFtn titrated with Fe(II) (B), ID-EncFtn titrated with Zn(II) (C), and ID-EncFtn titrated with Fe(II) followed by Zn(II) (D). Oligomerization states are stressed with colored shapes, monomer in blue circles and decamer in pink triangles.
