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Different mass peak intensities in one representative U87MG_mCherry tissue section. Invasive front of tumor cells displayed by tumor-specific masses 852, 1459 and 1562 m/z and marked by an arrow showing spreading of tumor cells toward normal tissue. In contrast, two additional tumor masses, 1428 and 1496 m/z, did not show tumor overlapping intensities. Scale bars represent 0.5 mm.
