Spin Echo Inversion Recovery Images (T1=1900 ms) of the Tubes Containing Isolated Mitochondria (top) or Post-Mitochondrial Supernatant (bottom) in PBS Containing Succinate and the Nitroxides, as Indicated. (Adapted with permission from Ref.678. This research was originally published in Proceedings of the International Society for Magnetic Resonance in Medicine. Prah D, Paulson E, Zielonka J, Hardy M, Joseph J, Kalyanaraman B, Schmainda K. (2007) In Vitro Mitochondrial Labeling using Mito-CarboxyPROXYL (Mito-CP) Enhanced Magnetic Resonance Imaging. Proc Intl Soc Mag Reson Med 15:1162.)