Good point. I read part of the linked research:
"
Invitro cultured human embryos provide insights about the self-organizing properties and autonomy of early human development.
However, protocols for invitro human embryo culture beyond the
blastocyst stage remain suboptimal. Furthermore, bioethical guide-
lines prohibit invitro culture of human embryos beyond 14 days post-
fertilization or reaching the onset of primitive streak (PS) development.
Human and mouse pluripotent stem cells in a developmental state sim-
ilar to the epiblast have been used for modelling post-implantation
development of human and mouse embryos. Thus, models based
on stem cells are an important ethical alternative to the use of natural
conceptus, especially as they can model only part of the conceptus."
ASo then I had to look up pluripotent stem cells:
"Pluripotent stem cells are master cells. They’re able to make cells from all three basic body layers, so they can potentially produce any cell or tissue the body needs to repair itself. This “master” property is called pluripotency. Like all stem cells, pluripotent stem cells are also able to self-renew, meaning they can perpetually create more copies of themselves."
Thanks.
Although it does indicate perhaps the source material is from abortions.
To my mind this is extra expensive and foolish (leaving aside the ethics of using abortion derived cells).
More could be learned using model systems of mouse and monkey.