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Chimerism doesn't always involve twins. Even mothers and babies "trade" cells during pregnancy, usually in very tiny amounts. "A baby's DNA can end up in the mother's bloodstream, because they are linked together through the placenta," says Parisi.
The reverse is also true: A baby can acquire some of the mother's DNA, in a condition known as microchimerism.
Because chimerism usually doesn't cause problems, it's rarely diagnosed, making it hard for scientists to say how prevalent the phenomenon truly is. It's probably less rare than was once thought. Perhaps many of us are chimeras and just don't know it.
Before the 1960s, it was believed that the placenta was a perfect barrier between mother and fetus, and no blood or cells could trespass it in either direction. Today we know that there’s actually a two-way exchange of cells between mother and fetus during pregnancy. What’s even more surprising is that these “extraneous” cells outlast the duration of the pregnancy and can in fact be found in the child and/or the mother years after birth. Male DNA has been found in women years after they had given birth to their sons. In fact, fetal cells are released in high quantities during spontaneous abortions, hence can be found even in women who have never delivered, so long as at some point in their lives they became pregnant.
Conversely, maternal cells have been found in the liver, lung, heart, thymus, spleen, adrenal, kidney, pancreas, brain, and gonads of healthy adults. Microchimerism (i.e. the presence of small concentrations of genetically distinct cells) could also originate from siblings’ cells, transferred from the mother during successive pregnancies. Regardless of the direction of transfer, the extraneous cells migrate to a certain tissue, where they differentiate and proliferate, acting as if they were engrafted.
You're free to think that, but that doesn't make it correct. The only thing you 'own' in regards to a body, or body parts, are that which has your exact DNA.
Do you think one person's rights should Trump (lol) another person's rights?
I do, on all three.
LONDON — Ireland’s ban on most abortions subjects women to cruel, degrading and discriminatory treatment, and should be lifted in cases of fatal fetal abnormalities, a committee of United Nations human rights experts said on Thursday.
The committee found that Ireland had violated a pregnant woman’s human rights by forcing her to choose between carrying her fetus to term — knowing it would not survive — or traveling abroad for an abortion.
The committee urged Ireland to change its laws — “including, if necessary, its Constitution” — to allow abortions and to let medical providers give information on abortion services “without fearing being subjected to criminal sanctions.”