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Expression of MnSOD in human breast cancer. (a) Migrating cancer cells (indicated by arrows) show stronger MnSOD staining than tumor cells in primary tumor mass (upper left corner). (b) A small cluster of tumor cells (micrometastasis) in lymph node (right) exhibits higher MnSOD expression than cells in matched primary tumor (left). (c) Tumor cells in established lymph-node macrometastasis (right) display increased MnSOD expression compared with those in matched primary tumor (left)
