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Neurite length (mean ± standard error) versus time. MNP-labeled differentiated PC12 cells were incubated in absence of magnetic field (M−(0/144 h)), in presence of the magnetic field (M+(0/144 h)) or removing the magnetic field after 72 h ((M+(0/72h) + (M−(72/144 h)). Two-way ANOVA, Bonferroni correction: n > 200, ∗ is the significance versus the group M−(0/144 h), and # is the significance versus the group (M+(0/72 h) M−(72/144 h)).
