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Morphology of spheroid tumor stromal progenitor cells from fresh ovarian cancer tissues. Phase contrast images of ovarian cancer cells (passage 2, cultured in medium B) deriving from patients with serous type adenocarcinoma: #6 (a: 40X; b: 100X), #8 (c: 40X), and #9 (d: 40X). All cells display the mesenchymal-like morphology of the ascites cells from the same patient, forming spheroid-like structures in most observed fields.
