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Contrast-enhanced coronal MR images of tumor-bearing mice with Gd-DTPA cystine diethyl ester copolymer (0.1 mmol-Gd/mmol) after treatment with saline (a), a cationic polyethyleneimine copolymer (b), an anti-VEGF siRNA (c), and a polymer–siRNA complex (d) for 21 days. Arrows point to the tumors.
