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On the left is a normally developing mouse embryo, on the right is a slightly larger mouse embryo that also contains horse cells that glow green.
Chimera research opens new doors to understanding and treating disease
Animals with human cells could provide donor organs or help us understand neuropsychiatric disorders.
Chimera research opens new doors to understanding and treating disease
Chimera research opens new doors to understanding and treating disease

Animals with human cells could provide donor organs or help us understand neuropsychiatric disorders.

Animals with human cells could provide donor organs or help us understand neuropsychiatric disorders.

embryos

Image of in vitro fertilization
Should the scientific community abandon the 14-day rule for research on human embryos?
Ida Emilie Steinmark, PhD | Jul 5, 2023 | 2 min read
Research on human embryos is usually limited to the first 14 days of development, but as scientific capabilities improve, some argue that it is time to go further.
microscope image series showing synthetic embryo development
Mouse Embryo: No Sperm, Egg, or Uterus Required
Christie Wilcox, PhD | Aug 2, 2022 | 3 min read
Using stem cells and a bioreactor, researchers generated living embryos that survived for more than a week and began to develop internal organs.
Lab-Grown Mouse Embryos Form Limbs and Organs
Lisa Winter | Mar 19, 2021 | 3 min read
The embryos completed one-third of their total gestation outside of a uterus.
New Techniques Detail Embryos’ First Hours and Days
Jef Akst | Dec 1, 2017 | 10+ min read
New technologies reveal the dynamic changes in mouse and human embryos during the first week after fertilization.
Scientists Doubt Results of CRISPR’d Embryos
Aggie Mika | Aug 31, 2017 | 2 min read
Six scientists question the authors’ conclusions about the DNA repair process that led to the human embryos’ correction of a defective gene.
Call for Germline Editing Moratorium
Jef Akst | Mar 13, 2015 | 2 min read
In response to speculation that groups have edited the DNA of human embryos, researchers request that gene editing of human reproductive cells be halted.
Dinosaur Embryo Graveyard
Ed Yong | Apr 10, 2013 | 3 min read
A treasure trove of fossilized dinosaur embryos shows signs of extremely fast growth.
Coming to Terms
Anna Ajduk and Magdalena Zernicka-Goetz | Nov 1, 2012 | 10+ min read
New noninvasive methods of selecting the most viable embryo could revolutionize in vitro fertilization.
Self-cloning Coral
Hannah Waters | Mar 1, 2012 | 3 min read
Coral embryos broken apart by waves can continue developing into adult clones.
Coral Clones
Hannah Waters | Mar 1, 2012 | 1 min read
The colorful and fragile start to the life of a living reef
Test-Tube Zoo Babies
Jef Akst | Mar 1, 2012 | 4 min read
A National Zoo researcher works to perfect gamete preservation and in vitro fertilization techniques in order to better manage endangered populations.
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