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X-band EPR spectra of heart homogenates from mice of different ages. A, 4 weeks; B, 12 weeks; C, 32 weeks; D, 52 weeks; E, 60 weeks. EPR conditions: temperature, 4 K; microwave frequency, 9.37 GHz; microwave power, 0.2 milliwatt (30 dB); modulation amplitude, 10 G. Dashed vertical lines indicate the fields corresponding to g values of 2.16, 2.00, 1.93, and 1.86.
