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development

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A chemically stained mouse embryo and mouse embryo model against a black background.
developmental biology

‘Embryo Models’ Challenge Legal, Ethical and Biological Concepts

By Philip Ball
June 13, 2023
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With embryolike constructs built entirely from stem cells, researchers can revolutionize our understanding of development. But how close to an embryo is too close?

A stylized illustration showing half the heads and brains of a lizard and a mouse in cross-section side by side.
evolution

Gene Expression in Neurons Solves a Brain Evolution Puzzle

By Allison Whitten
February 14, 2023
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The neocortex of our brain is the seat of our intellect. New data suggests that mammals created it with new types of cells that they developed only after their evolutionary split from reptiles.

Researcher Kristy Red Horse holding a model of a human heart, with a lemon tree behind her.
Q&A

She Studies Growing Arteries to Aid Heart Attack Recovery

By Claudia Dreifus
February 13, 2023
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Regenerative medicine researcher Kristy Red Horse’s discoveries may someday help damaged hearts heal better. Her stewardship of her Native American heritage may advance science in other ways too.

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