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Scientists use stem cells to create models of pre-embryos

In the future, the stem cells reprogrammed from adult cells are likely to become the new standard in research.

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Over 100 Eggs With Embryos Reveal Earliest Known Dinosaur Herds

A Jurassic graveyard at the Laguna Colorada Formation in Patagonia, Argentina, with numerous bones and more than a hundred fossilized eggs has revealed the earliest evidence of dinosaurs living in herds. In fact, the bones belonged to 80 Mussaurus patagonicus, a group of long-necked herbivorous sauropodomorph dinosaurs. The large amount of eggs and bones –... Read more »

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Using genetic screening for selecting the 'best' embryo in IVF

Each year, tens of thousands of babies are born in the United States as the result of IVF (in vitro fertilization) – where several eggs are fertilized outside the mother's body and then an embryo is selected for transfer into her womb.

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90-Million-Year-Old Egg With Embryo Was Laid by a Human-Sized Turtle

An incredibly rare egg with an embryo still inside was laid by a gigantic turtle during the time of the dinosaurs. Named Yuchelys nanyangensis, the giant terrestrial turtle laid a bunch of eggs in Henan Province, China, about 90 million years ago but one of them never hatched. These eggs were almost the size of... Read more »

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14-day limit prohibition for human embryo research abandoned


14-day limit prohibition for human embryo research abandoned
June 1, 2021
The international scientific body governing stem cell research is abandoning the absolute 14-day limit on culturing human embryos in the laboratory, putting pressure on Canada’s law prohibiting the practice.
“As happens so often in human affairs, opening the door on a controversial but somewhat defensible position (not from the Church’s point of view though) bumps up against a boundary which is first deemed arbitrary and then seen as limiting true science. So the push is on to expand the pool of available research material,” Redemptorist bioethicist Fr. Mark Miller told

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First human-monkey embryo sparks debate


First human-monkey embryo sparks debate
A joint team of US and Chinese scientists have, in breakthrough research, grown human cells in monkey embryos in a laboratory for up to 20 days
Representative image
New York: A joint team of US and Chinese scientists have, in breakthrough research, grown human cells in monkey embryos in a laboratory for up to 20 days. The development, which has sparked ethical debates, has implications for developing new models of human biology and disease.
Interspecies chimeras in mammals have been made since the 1970s, when they were generated in rodents and used to study early developmental processes. In the current study, detailed in the journal Cell, six days after the monkey embryos had been created, each one was injected with 25 human cells. The cells were from an induced pluripotent cell line known as extended pluripotent stem cells, which have the potential to contribute to both embryonic and extra-embryonic tissues.

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A Letter About Their Embryos Sends Couple Into a Tailspin


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Human-Monkey Hybrid Embryo Created by Joint China–U.S. Scientist Team


Human-Monkey Hybrid Embryo Created by Joint China–U.S. Scientist Team
On 4/16/21 at 11:28 AM EDT
A team of scientists from the U.S., China and elsewhere have developed embryos that are a mix of human and monkey cells for the first time in history.
The embryos, which were detailed on Thursday in the scientific journal Cell, were created for scientists to uncover new ways to produce organs for people who need transplants.
The researchers injected 25 stem cells from humans, known as induced pluripotent stem cells (or ISP cells), into embryos from macaque monkeys. The scientists then grew the mixed embryos in test tubes for up to 20 days in order to study how the animal and human cells communicate with one another.

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China-US scientists grow first human-monkey embryo, but is it ethical?


China-US scientists grow first human-monkey embryo, but is it ethical?
It’s not in bad taste, says Chinese researcher after injecting human stem cells into macaque embryos to explore possibility of growing organs for transplants
Most of the embryos died and others grew only low levels of human cells, but the progress achieved leads some to raise fears over where the experiments may lead

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Researchers uncover how cells control physical state of embryonic tissues

Researchers uncover how cells control the physical state of embryonic tissues By Sonia Fernandez Santa Barbara, CA In the earliest stage of life,...

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After IVF and Genetic Testing, She Had a Big Decision to Make

Jacquelynn Kerubo made a big decision right before New York City went into lockdown: to transfer a "mosaic" embryo into her uterus. As she explains in an essay for the...

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Scientists grow and observe mouse embryos outside the womb


Scientists grow and observe mouse embryos outside the womb
Researchers kept bottled mouse embryos alive about halfway through their usual gestation, observing formation of hind limbs and major organs.
A mouse embryo growing inside a beaker. Photo courtesy of Weizmann Institute
Nature that information about mammalian embryonic development comes either from observing the process in non-mammals like frogs or fish that lay transparent eggs, or by obtaining static images from dissected mouse embryos.
A mouse embryo grown six days outside the uterus reveals normal developmental markers. Photo courtesy of Weizmann Institute
The idea of growing embryos outside the uterus has been around since before the 1930s, Hanna said, but experiments had limited success and the embryos tended to be abnormal.

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Sofia Vergara's ex Nick Loeb's final appeal over embryo rights rejected


Sofia Vergara’s ex Nick Loeb's final appeal over embryo rights rejected
Entertainment
Thu, Apr 01, 2021
Nick Loeb, who is Sofia Vergara's ex, had his final objections rejected by a Los Angeles court over the rights to use the frozen pre-embryos that they created when they were together.
The two had called it quits in their engagement in May 2014, a year prior to undergoing IVF treatments.
The
Modern Family star, who has a son Manolo, later tied the knot with Joe Manganiello in November 2015.
Sofia, in 2017, filed documents hoping to prevent her ex from using the pre-embryos without her written consent.

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Scientists Create Human 'Pre-Embryo' for Research


Scientists Create Human 'Pre-Embryo' for Research
By Dennis Thompson
HealthDay Reporter
WEDNESDAY, March 17, 2021 (HealthDay News) -- Research into miscarriages, infertility and birth defects is now primed to undergo revolutionary advances, thanks to the creation in the lab of an early stage of human embryos by two separate international teams of scientists.
Both teams were able to use human cells to create artificial blastocysts, an early stage of conception that occurs a few days after egg fertilization but prior to the implantation and development of an embryo in the uterus.
Until now, research into human blastocysts relied on embryo donations from in vitro fertilization (IVF) procedures, which were scarce and difficult to obtain.

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Human skin cells altered to mimic early stage of embryo development


Monash University
Living structures that model early human embryonic development have been generated entirely from cells in the skin. The models mean it should be possible to study infertility, early miscarriage and early embryonic development without the controversial use of real human embryos – although the models may raise ethical issues of their own.
Previously, the only means of studying the early development of human embryos was via blastocysts obtained from IVF procedures. Blastocysts are a ball-like early stage of embryonic development that is formed five days after fertilisation occurs and can go on to form embryos. But their use in science is controversial because of their potential to grow into a living human individual.

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