Another is that the transplanted bits of tumor act nothing like cancers
in actual human brains, Fine and colleagues reported
in 2006: Real - life glioblastomas grow and spread and resist treatment because they contain what are called tumor
stem cells, but tumor
stem cells don't grow well
in the
lab, so they don't
get transplanted into those mouse brains.
«The blood - brain barrier forms pretty early
in gestation, so the thyroid hormone, even from the mother, is probably not
getting through the barrier and into the brain, likely leading to developmental deficits,» says Shusta, whose group was among the first to develop blood - brain barriers from patient - derived
stem cells in the
lab dish.