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Electron micrographs of tumor cells in this tumor mass. Clusters of several tumor cells surrounding round collagen-rich stromata are often observed. A: Clusters contain a small amount of stroma. Bar=2 μm. B: Clusters have a relatively-abundant stroma, and they adhere to one another. Bar=2 μm. Inset: Membranous structures suspected to be cytoplasmic organelles accumulate at the center of a round stroma. Bar=0.2 μm.
