CHIMERA:
A special kind of mosaicism in which an individual or tissue contains a
mix of cells derived from two genetically different individuals. The
blood of a patient who had a transfusion from another individual would
be chimeric for example.
More in this article at...
http://anthro.palomar.edu/blood/ABO_system.htm
"A small number of people have two different ABO blood types. They are
not simply AB codominant. Apparently, most of these blood chimera
individuals shared a blood supply with their non-identical twin before
birth. In some cases, people are unaware that they had a twin because
he or she died early in gestation and was spontaneously aborted. As
many as 8% of non-identical twins may have chimeric blood. Some people
are microchimeric--they have a small amount of blood of a different
type in their system that has persisted from a blood transfusion or
passed across the placental barrier from their mother before birth.
Likewise, fetal blood can pass into a mother's system. This fact has
led some researchers to suggest that the significantly higher frequency
of autoimmune disorders in women is a result of the presence of foreign
white blood cells that had come from their unborn children during
pregnancy."
And another article of some interest...
http://www.ananova.com/news/story/sm_838312.html?menu=news.scienceanddis
covery.genetics
Does the new testing method account for this possibility?
-WG