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fetal stage

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fetal stage,
(in embryology) the interval from the end of the embryonic stage, at the end of the seventh or eighth week of gestation, to birth, 38 to 42 weeks after the first day of the last menstrual period.


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Once again, usable cells were produced only after the researchers placed the cloned mouse embryos in "surrogate mother" mice, grew them to the late fetal stage (the equivalent of the fifth to sixth month of pregnancy in humans), then aborted them for their heart tissue.
The resultant embryo was implanted into a surrogate cow and grown to an early fetal stage, at which point the scientists were able to identify immature cells starting to differentiate into kidney cells.
 
 
 
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