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Small, round, yellow-coloured cells (arrows) – putative stem cells – with diameters of up to 4 μm: from testicular (T) cell cultures (attached to germinal cells, Sertoli cells or fibroblasts) or from ovarian (O) cell cultures (attached to epithelial or other types of cells). DAPI (blue) stained nuclei from ovarian (O) cell cultures. Scale bars: 10 μm.
