Study that Impregnated Male Rats Stirs Controversy
Study that Impregnated Male Rats Stirs Controversy
A combination of approaches, including uterus transplantation and the joining of two animals’ circulatory systems, allowed males to bear pups, according to a preprint. But some experts say the experiments were not justified.  
Study that Impregnated Male Rats Stirs Controversy
Study that Impregnated Male Rats Stirs Controversy

A combination of approaches, including uterus transplantation and the joining of two animals’ circulatory systems, allowed males to bear pups, according to a preprint. But some experts say the experiments were not justified.  

A combination of approaches, including uterus transplantation and the joining of two animals’ circulatory systems, allowed males to bear pups, according to a preprint. But some experts say the experiments were not justified.  

embryo
High Profile Developmental Biologist Lewis Wolpert Dies at 91
High Profile Developmental Biologist Lewis Wolpert Dies at 91
Shawna Williams | Feb 16, 2021
Wolpert, who conducted research at University College London, was known for his work on morphogenesis and pattern development in embryos and for his multiple books and broadcast appearances.
Panel Lays Out Guidelines for CRISPR-Edited Human Embryos
Panel Lays Out Guidelines for CRISPR-Edited Human Embryos
Lisa Winter | Sep 4, 2020
The International Commission on the Clinical Use of Human Germline Genome Editing claims the technology is still too risky for therapeutic use.
Image of the Day: Brainless Frogs
Image of the Day: Brainless Frogs
Amy Schleunes | Feb 18, 2020
Without a brain, the frog embryo immune system doesn’t receive the signals it needs to mobilize macrophages and fight infections.
A Woman of Firsts, Early 20th Century
A Woman of Firsts, Early 20th Century
Emily Makowski | Jan 13, 2020
Florence Sabin was known for her pioneering research and efforts to support women in science.
China Sentences Gene-Editing Scientist to Three Years in Jail
China Sentences Gene-Editing Scientist to Three Years in Jail
Emily Makowski | Dec 30, 2019
The modification of three babies’ genes by He Jiankui drew widespread criticism from scientists.
Photos of the Year
Photos of the Year
Emily Makowski | Dec 26, 2019
From bubbling plants to endangered whales, here are some amazing images from The Scientist in 2019.
Early Embryo Models Generated from Mouse Stem Cells
Early Embryo Models Generated from Mouse Stem Cells
Abby Olena | Oct 17, 2019
Extended pluripotent stem cells from mice can self-organize to form blastocyst-like structures called blastoids that enable a closer look at early mammalian development.
First Human–Monkey Chimeras Developed in China
First Human–Monkey Chimeras Developed in China
Nicoletta Lanese | Aug 5, 2019
The researchers aim to grow transplantable human organs from primate embryos.
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.
Claim of First Gene-Edited Babies Triggers Investigation
Claim of First Gene-Edited Babies Triggers Investigation
Catherine Offord | Nov 26, 2018
He Jiankui says he has successfully used CRISPR-Cas9 to tweak the genes of twins born earlier this month. Some independent experts are dubious.
First Mouse Embryos Made from Two Fathers
First Mouse Embryos Made from Two Fathers
Abby Olena | Oct 11, 2018
The bipaternal pups died soon after birth, but mice with two mothers grew into fertile adults.