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Coronal MR images of tumor-bearing mice before (a) and 5 (b), 15 (c), 30 (d), and 60 (e) minutes after intravenous injection of Gd-DTPA cystine copolymer (A), Gd-DTPA cystine diethyl ester copolymer (B), Gd-DTPA cystamine copolymer (C), and Gd-(DTPA-BMA) (D) at a dose of 0.1 mmol-Gd/kg.
