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Transmission electron microscopy. Melanoma cells (MC) adhering and invading endothelial cells (EC). (a–c) It is possible to observe a melanoma cell completely immersed in the cytoplasm of HUVEC cell. (d–f) Adhering tumour cells degrading the cytoplasm of endothelial cells (asterisk). (a–d) Bar: 10 µm. (e,f) Bar: 5 µm.
