First Human–Monkey Chimeras Developed in China
First Human–Monkey Chimeras Developed in China
The researchers aim to grow transplantable human organs from primate embryos.
First Human–Monkey Chimeras Developed in China
First Human–Monkey Chimeras Developed in China

The researchers aim to grow transplantable human organs from primate embryos.

The researchers aim to grow transplantable human organs from primate embryos.

embryo
Turtle Embryos May Have a Say in Deciding Their Sex
Turtle Embryos May Have a Say in Deciding Their Sex
Katarina Zimmer | Aug 1, 2019
In a species of freshwater turtle, embryos can move toward warmer or cooler environments within the egg and thus help choose their sexual destiny, but not all experts are convinced.
Scientists Push for a Moratorium on Human Germline Editing
Scientists Push for a Moratorium on Human Germline Editing
Ashley Yeager | Mar 13, 2019
After the reported birth of CRISPRed babies in China, experts want to take time to consider the scientific, social, ethical, and philosophical consequences of editing heritable human DNA.
Doctors Report World’s Second Case of “Semi-Identical” Twins
Doctors Report World’s Second Case of “Semi-Identical” Twins
Catherine Offord | Feb 28, 2019
The extremely rare event, thought to be caused by two sperm cells fertilizing the same egg simultaneously, was last reported in 2007.
Image of the Day: Cellular Tracks
Image of the Day: Cellular Tracks
Carolyn Wilke | Jan 21, 2019
To study the fate of stem cells in developing chick embryos, researchers trace their steps over time.
Image of the Day: Embryo in Blue
Image of the Day: Embryo in Blue
Carolyn Wilke | Jan 7, 2019
A bright blue stain highlights the sensory nerves of a developing mouse embryo.
CRISPR Scientists Slam Methods Used on Gene-Edited Babies
CRISPR Scientists Slam Methods Used on Gene-Edited Babies
Katarina Zimmer | Dec 4, 2018
Since He Jiankui presented his results at last week’s gene editing summit, researchers have raised concerns about his protocol, calling the procedure “amateurish” and “unconscionable.”
Discovery’s Crest: A Profile of Marianne Bronner
Discovery’s Crest: A Profile of Marianne Bronner
Anna Azvolinsky | Dec 1, 2018
Studying how neural crest cells journey through the embryo, this Caltech developmental biologist has revealed how they form major cell types, including peripheral neurons, bone, and smooth muscle.
Opinion: Don’t Ban the Use of CRISPR in Embryos
Opinion: Don’t Ban the Use of CRISPR in Embryos
John D. Loike | Nov 29, 2018
Despite a premature and ethically sketchy claim of genome editing in twin girls, an outright prohibition could blunt promising, responsible progress.
Second CRISPR-Modified Pregnancy May Be Underway
Second CRISPR-Modified Pregnancy May Be Underway
Ashley P. Taylor | Nov 28, 2018
He Jiankui, who reportedly edited the genomes of two babies already, broke the news at a conference in Hong Kong.