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. 2019 May 5;9(5):699. doi: 10.3390/nano9050699

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) T₁-weighted MR images (B₀ = 1 T) of mice collected before (control group) and after intravenous injection of Fe₃O₄-PAA at time points of 30, 60, 90, 120, 160 and 180 min. The corresponding relative T₁-weighted signals extracted from (b) tumor (orange circle) and (c) kidney (dark yellow circle) sites.