Three types of magnetic resonance signals with a g-value above 2.1 were found in rat spinal cord tissues: a wide signal independent on the sample orientation in magnetic field and two types of narrow signals — one-component and two-component with orientation dependence. The temperature behavior of these three types of signals has been studied. It is supposed that the wide signal may be due to ferritin crystal core; and the characteristics of the orientation-dependent signals correspond to the crystalline particles of magnetite.
Yurtaeva et al. (Wed,) studied this question.