... of the addi-tion was the total disappearance of specific resonanceswithout the concomitant appearance of other signalsin other parts of the spectrum. This result could be a consequence of the ... protein ratio, the resonances of Arg20, Asp22 and Asp23 disap-peared, and the resonance of Leu21 shifted. At a 2 : 1ratio, the resonances of residues 19 and 44 also disap-peared, whereas those of ... Gakh O, Park S, Ryde U,Lindahl M, Leath K, Garman E, Isaya G & Al-Kara-daghi S (2006) The structures of frataxin oligomersreveal the mechanism for the delivery and detoxification of iron....