Fig. 3
The live serial signal change in the iron nanoparticles (ICG-SPIO) after intrathecal administration [a, c (0–30 min, with magnet), b, d (0–180 min)]. The signal of different magnet polarities (N-S) seems to accumulate more in the lumbar area than in the same polarity (N-N) group. The bioluminescence intensity is indicated as photon-flux (photons/s/cm2/steradian). Values are mean ± S.E.M