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Breast carcinoma cells undergo spontaneous homotypic hybridization, producing cells that continue proliferating. Micrographs of double-labeled (EGFP + DsRed) MA11 cells derived from a co-culture of MA11-EGFP (green) and MA11-DsRed (red). Images, taken at 3-day co-culture (D0) and 7 days later (D7), reveal rapid proliferation of yellow hybrid cells. Scale bar = 50 μm.
