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Rearrangements of nucleolar morphology in MtTdp2α-overexpressing lines exposed to etoposide. Ultrastructural morphology of the nucleolus in M. truncatula cells (A, CTRL and B, Tdp2α-28 lines) challenged with 150 μM etoposide. The blue line surrounds the chromatin (ch, arrow) areas from which the nucleolus is stemming out. The red line surrounds the Dense Fibrillar Component (dfc, arrow).
