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. 2012 Jul 19;7(7):e41363. doi: 10.1371/journal.pone.0041363

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Lindhoud et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) LC-MS spectrum of flavodoxin. (B) Nano-electrospray mass spectrum of flavodoxin. M_H ⁺ⁿ represents flavodoxin monomer with n positive charges, and M⁺ⁿ is apoflavodoxin monomer with n positive charges. (C and D) Spectra of area indicated by the grey contour in (A) and (B), respectively. Flavodoxin (5 µM) is in 50 mM ammonium acetate, 0.1 mM EDTA, pH 6.8.