The abbreviations used are: NGAL, neutrophil gelatinase-associated lipocalin; HSQC, heteronuclear single quantum coherence; ITC, isothermal titration calorimetry; LCN2, lipocalin 2; LCN2-R, LCN2 cellular receptor; LCN2-R-NTD, N-terminal domain of the lipocalin 2 receptor; mLCN2, mouse LCN2; rL...