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stem cells

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Sergiu Paşca in his lab at Stanford University, in front of a rack of equipment.
Q&A

Human Brains Are Hard to Study. He Grows Useful Substitutes.

By Claudia Dreifus
October 12, 2022
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With stem cell technology and lab-grown brain organoids, Sergiu Paşca seeks the causes of autism and other neuropsychiatric conditions.

Green cross section of a brain with a large bright area in its left hemisphere.
neuroscience

Lab-Grown Human Cells Form Working Circuits in Rat Brains

By Allison Whitten
October 12, 2022
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Letting human brain organoids grow in animal brains could be an ethical new option for experimental studies of neurological disorders.

Artist’s illustration representing the immune system standing guard against a world of pathogens.
The Joy of Why

Why Is Inflammation a Dangerous Necessity?

By Steven Strogatz
April 20, 2022
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The immune system protects us from a full spectrum of pathogens, but without balance, it can end up hurting us over time, too. The immunologist Shruti Naik explains how our defenses can turn on us.

Illustration of an immune cell that wields weapons on one side of its body and construction tools on the other.
immunology

Immune Cell Assassins Reveal Their Nurturing Side

By Monique Brouillette
February 11, 2020
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Don’t be misled by the bloodthirsty names of immune cells. Mounting research shows that the cells also fine-tune tissues and help the body heal.

VIDEO OPENER: TIME-LAPSE OF FLOWER OPENING.
botany

Unexpected ‘Germline’ Plant Cells May Shield New Generations

By Charlie Wood
August 5, 2019
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To avoid passing on new mutations to offspring, plants may minimize the number of divisions by the stem cells that make flowers and seeds.

evolution

Scientists Debate the Origin of Cell Types in the First Animals

By Jordana Cepelewicz
July 17, 2019
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Theories about how animals became multicellular are shifting as researchers find greater complexity in our single-celled ancestors.

Art for "To Heal Some Wounds, Adult Cells Turn More Fetal"
developmental biology

To Heal Some Wounds, Adult Cells Turn More Fetal

By Jordana Cepelewicz
August 29, 2018
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Once again, body cells reveal unexpected plasticity: In a newly discovered type of wound healing, which some researchers call “paligenosis,” adult cells revert to a more fetal state.

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