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(a) Graph shows energy dependence of x-ray attenuation of water due to Compton scatter and photoelectric effect, as compared with attenuation of k-edge material (ie, gold). (b) Schematic illustration of macrophage-targeted gold core nanoparticle Au-HDL. HDL = high-density lipoprotein. (c) Characterization of Au-HDL on negative-stain transmission electron microscopy (TEM) image.
