Even if the entire blastocyst had been implanted into a womb, it wouldn't have yielded a human clone.
WSJ: Experiment Brings Human Cloning One Step Closer
That led to a blastocyst, a hollow ball of 50 to 100 cells.
For a fetus to form, the blastocyst must be implanted in a womb.
After a couple of days, the newly nucleated cell should have divided to form a ball of cells called a blastocyst.
ECONOMIST: Cloning around
The blastocyst was "missing a few cell types that it would need to implant" and was suffering other deficiencies, said Dr. Mitalipov.
But in the first experiment we got a blastocyst and within a couple of months we already had an (embryonic) stem cell line.
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An inner clump of cells in the blastocyst goes on to form the embryo, while an outer layer goes on to make the placenta.
In a laboratory at Cambridge in 1968, he first saw life created outside the womb in the form of a human blastocyst, an embryo that has developed for five to six days after fertilisation.
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