The Blueprint for Life, Neatly Folded

The Blueprint for Life, Neatly Folded
AP Photo/Sait Serkan Gurbuz

Squinting through his microscope at salamander cells, late-nineteenth-century biologist Walther Flemming spotted a curious substance deep inside the cells' nuclei that selectively soaked up the stain he was using. The stuff looked like a skein of wool — until, that is, a cell underwent division.

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