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Genes & Cells

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female mouse embryo

DOUBLING UP A normal female mouse embryo (left) has only female reproductive tissue, called the Müllerian duct (pink). Removing a protein called COUP-TFII causes a female mouse embryo (right) to develop both the female duct and male tissue called the Wolffian duct (blue).

black-legged tick on the left, lone star tick on the right

TICK TIMES TWO It can be difficult to correctly diagnose tick-borne diseases in locales with both the black-legged tick (left), which spreads Lyme disease, and the lone star tick (right), which can transmit southern tick‒associated rash illness or STARI.

archaea microbe DNA

WOUND UP  Archaea microbes wrap their DNA (represented in yellow) around proteins called histones (purple) akin to the way plants and animals do. 

Genes & Cells

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