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H&E (a,b) and Perls Prussian blue (c,d) sections of a lymph node in the skin of a cured mice treated with 25 µg in iron of M-PLL per mm3 of tumor followed by 15 MS and collected at D250. (a), the whole lymph node. (b), an enlargement of (a) showing macrophages (black arrows). (c) and (d), enlargements of (a) showing blue coloration in the cytoplasm of macrophages (black arrows) suggesting the elimination of M-PLL from the region of initial tumor location by macrophages.
