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Cells

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white rhino

VANISHING ACT  These two female northern white rhinos, seen here at the Ol Pejeta Conservancy in Kenya, are the only living members of their subspecies.

LINE-1 gene

LINE-1 DANCE  RNA copies of a jumping gene called LINE-1 (red) are mass produced in mouse embryos at the two-cell stage of development (shown). DNA is shown in blue and cells’ outer boundaries are drawn in orange in this microscope image. 

mouse embryonic stem cells

MARKING THE SPOTS In this super-resolution microscope image of mouse embryonic stem cells, molecules of the enzyme that copies DNA instructions into RNA messages cluster in multiple spots within the nucleus. White spots have more of the enzyme, RNA polymerase II, concentrated in them than in the cooler blue spots.

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