Fig. 3. Characteristics of magnetoferritins. (a) TEM images of negative-stained magnetoferritins (M-HFn₅₀₀₀, M-PfFn₅₀₀₀, and M-PcFn₅₀₀₀). Scale bar is 50 nm. (b) DLS analysis of native M-HFn₅₀₀₀, M-PfFn₅₀₀₀, M-PcFn₅₀₀₀ nanocages, with diameters in solution of 13.6, 15.3, 15.5 nm, respectively. (c) TEM images of M-HFn5000, M-PfFn5000, and M-PcFn5000 nanoparticles, and histograms of size distributions of magnetoferritins. Scale bar is 20 nm. (d) High-resolution TEM images showing lattice fringes of the magnetite cores. Scale bar is 1 nm.