Neuropathologic basis of quantitative susceptibility mapping in the substantia nigra: contributions of tau, pigmented neurons, and iron. - Ono D; Kondrakunta S; Mak E; Przybelski SA; Fought AJ; Schwarz CG; Murray ME; Nguyen A; Reichard RR; Senjem ML; Gunter JL; Jack CR Jr; et al. (Acta neuropathologica, 2026)