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.  

reproductive biology
Polycystic Ovary Syndrome May Be Inherited Epigenetically
Polycystic Ovary Syndrome May Be Inherited Epigenetically
Katarina Zimmer | Feb 9, 2021
Female mice modeling the hormonal disorder can pass symptoms down for several generations, likely via changes in genome methylation that are similarly observed in women with PCOS.
Eight Proteins Turn Mouse Stem Cells into Egglike Cells
Eight Proteins Turn Mouse Stem Cells into Egglike Cells
Ashley Yeager | Dec 16, 2020
The identification of the transcription factors that elicit oocyte growth will aid reproductive biology research and might help women with fertility issues, scientists say.  
Single-Cell Analysis of Ovarian Cortex Fails to Find Stem Cells
Single-Cell Analysis of Ovarian Cortex Fails to Find Stem Cells
Amy Schleunes | Mar 6, 2020
The controversial oogonial stem cells eluded a team of Swedish researchers who mapped high-quality tissue samples of the human ovary, prompting more questions about the cells’ existence.  
Swamp Wallabies Can Have Two Separate Pregnancies at Once
Swamp Wallabies Can Have Two Separate Pregnancies at Once
Lisa Winter | Mar 3, 2020
Before the joey is born, another pregnancy has already started.
Endocrinologist and Reproductive Physiologist Wayne Bardin Dies
Endocrinologist and Reproductive Physiologist Wayne Bardin Dies
Catherine Offord | Nov 18, 2019
Bardin’s work helped lead to the development of long-acting contraceptive devices for women.
Human Testicles Contain Endocannabinoid System Components
Human Testicles Contain Endocannabinoid System Components
Ruth Williams | Sep 19, 2019
Proteins that synthesize, bind, and degrade endocannabinoids are present in the body’s sperm factories, suggesting that the use of cannabis may directly affect them.
Researchers Develop New Method for Sexing Sperm
Researchers Develop New Method for Sexing Sperm
Katarina Zimmer | Aug 13, 2019
Scientists found they could sort mouse sperm prior to IVF by treating semen with a drug that selectively slows down X-bearing cells.
Fruit Flies Hide Their Eggs in Plain View
Fruit Flies Hide Their Eggs in Plain View
Karl Gruber | Jun 1, 2019
Chemical cues help Drosophila mask their eggs from predators.
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.
Spotted Seatrout Continued to Spawn During and After Hurricane Harvey
Spotted Seatrout Continued to Spawn During and After Hurricane Harvey
Jef Akst | Nov 16, 2018
Researchers recovered audio recordings of the fish’s mating calls in the eye of the storm.
Image of the Day: Plundered Plover
Image of the Day: Plundered Plover
Jef Akst | Nov 9, 2018
Nest predation of shorebirds that raise young in the Arctic are up threefold since the mid-20th century, and climate change may be to blame, according to a study.
Genetic Risk Factor for Erectile Dysfunction Identified
Genetic Risk Factor for Erectile Dysfunction Identified
Ashley P. Taylor | Oct 9, 2018
Researchers believe the genetic locus affects the regulation of another gene involved in sexual function.
Conservation Biologist and Placenta Expert Kurt Benirschke Dies
Conservation Biologist and Placenta Expert Kurt Benirschke Dies
Shawna Williams | Sep 14, 2018
He established the San Diego Zoo’s cryopreserved Frozen Zoo.
BPA and Its Replacements Have Same Effects on Mice
BPA and Its Replacements Have Same Effects on Mice
Kerry Grens | Sep 13, 2018
The plastic ingredients BPS and diphenyl sulfone cause chromosomal abnormalities, and the effects can last for generations.
Image of the Day: The Long and Short of It
Image of the Day: The Long and Short of It
Sukanya Charuchandra | Aug 20, 2018
For flycatchers, the attractiveness of male birds is tied to the length of their sperm.
Fossilized Beetle Is Earliest Evidence of Insect Pollinator
Fossilized Beetle Is Earliest Evidence of Insect Pollinator
Abby Olena | Aug 16, 2018
A 99-million-year-old beetle preserved in amber alongside grains of pollen likely pollinated prehistoric plants.
Image of the Day: Revved Up
Image of the Day: Revved Up
Sukanya Charuchandra | Aug 16, 2018
Progesterone helps in the transportation of eggs within the mouse reproductive system.
Opinion: Three-Parent Embryos—A Slippery Slope?
Opinion: Three-Parent Embryos—A Slippery Slope?
John D. Loike, Alan Kadish | Jun 14, 2018
The use of pronuclear transfer to treat infertility must first be backed by evidence it can work in cases where parents seek to avoid mitochondrial mutations.
Image of the Day: Hold My Brood
Image of the Day: Hold My Brood
The Scientist Staff, The Scientist Staff | May 9, 2018
Cuckoo catfish trick cichlids into caring for their eggs in a strategy known as brood parasitism.