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(A,B) STEM images of iron oxide nanoparticles formed within H-rich and L-rich ferritin in the absence (A) and presence (B) of 10 mM phosphate, at 10 nm magnification. (C,D) EDX spectra showing the estimated ratio of P/Fe in L-rich and H-rich ferritins. (E,F) STEM-EELS analysis shows the X-ray absorption spectra at the L3 and L2 edges of iron in H-rich and L-rich samples containing 1000 Fe atoms/core in the absence of phosphate.
