This definition excludes stem cells that are cultivated
from younger embryos that have yet to reach the 70 - 100 cell blastocyst stage.
In the early 1950s, Robert Briggs and Thomas King repeated Spemann's experiments using a species of leopard frog, Rana pipiens, first with a nucleus
from young embryos (Briggs and King, 1952) then from older embryos (King and Briggs, 1954); both the younger and older implanted nuclei could still be reprogrammed by the enucleated host cell.
Not exact matches
In humans, the unborn
young from the end of the eighth week after conception to the moment of birth, as distinguished
from the earlier
embryo.
But when Joris Vermeesch
from the Centre for Human Genetics in Leuven, Belgium, and colleagues examined 23
embryos from nine
young, fertile couples who were undergoing IVF for screening purposes, they found that 21 had chromosomal abnormalities, suggesting these are in fact the norm (Nature Medicine, DOI: 10.1038 / nm.1924).
Satellites have detected intense x-rays blazing
from the
youngest stellar
embryo yet seen, an object perhaps 10,000 years old.
Researchers treated mahi - mahi
embryos and
young fish with oil collected
from near the damaged wellhead and
from the gulf's surface.
Stem cells plucked
from embryos were deemed extremely
young by the clock, while neural cells
from centenarians were estimated to be about 100.
Further experiments with eggs
from Panama showed that
embryos as
young as 4 days old could accomplish the same feat.
In addition to the seeds that contain the plant
embryo, they collected leaves
from young and mature Parkia trees in the home range of tamarins.
The process was tested on 18 lab - created
embryos using sperm
from the male donor and eggs donated by 12 healthy
young women, the study said.