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PAI and PET for mice with melanoma metastatic to the liver. (A) Images on different days after tumor cell injection at 3-d intervals. Scale bars in all images are 1 mm. (B) Number of tumors over time. Signal ratio for melanoma metastases to liver was quantified in PAI and PET at 8 and 14 d after tumor cell injection. MM = melanoma metastasis.
