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A manganese-based contrast agent for magnetic resonance imaging has been obtained by partial reduction/dissolution of solid β-MnOOH inside the cavity of apoferritin (see scheme). The resulting nanocarriers contain up to 300–400 MnII aqua ions and have a remarkable relaxivity of 4000–7000 mM−1 s−1 per apoferritin unit.
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Kálmán et al. (2009) studied this question.
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