Question: What kind of organisms have stem cells?
About the article "Stem cell", section "Abstract".

Candidate passages:
Most progenitors are described as oligopotent.
In this point of view, they may be compared to adult stem cells.
But progenitors are said to be in a further stage of cell differentiation.
They are in the “center” between stem cells and fully differentiated cells.
The kind of potency they have depends on the type of their "parent" stem cell and also on their niche.
Some progenitor cells were found during research, and were isolated.
After their marker was found, it was proven that these progenitor could move through the body and migrate towards the tissue where they are needed.
Many properties are shared by adult stem cells and progenitor cells.
But still, controversy remains because embryonic stem cells are true stem cells in that they are pluripotent and show unlimited capacity for self-renewal.
In contrast, many cells termed adult stem cells would be better defined as progenitor cells, as their capacities for unlimited self-renewal and plasticity have not been comprehensively demonstrated.
Progenitor cells are found in adult organisms and they act as a repair system for the body.
They replenish special cells, but also maintain the blood, skin and intestinal tissues.
They can also be found in developing embryonic pancreatic tissue. 
The information presented here covers the legal implications of embryonic stem cells (ES), rather than induced pluripotent stem cells (iPSCs).
The laws surrounding the two differ because while both have similar capacities in differentiation, their modes of derivation are not.
While embryonic stem cells are taken from embryoblasts, induced pluripotent stem cells are undifferentiated from somatic adult cells.
Stem cell are cells found in most, if not all, multi-cellular organisms.
A common example of a stem cell is the Hematopoietic stem cell (HSC) which are multipotent stem cells that give rise to cells of the blood lineage.
In contrast to multipotent stem cells, embryonic stem cells are pluripotent and are thought to be able to give rise to all cells of the body.
Embryonic stem cells were isolated in mice in 1981, and in humans in 1998.
Stem cell treatments are a type of cell therapy that introduce new cells into adult bodies for possible treatment of cancer, Somatic cell nuclear transfer, diabetes, and other medical conditions.
Cloning also might be done with stem cells.
Stem cells have been used to repair tissue damaged by disease.
Because Embryonic Stem (ES) cells are cultured from the embryoblast 4–5 days after fertilization, harvesting them is most often done from donated embryos from "in vitro" fertilization (IVF) clinics.
In January 2007, researchers at Wake Forest University reported that "stem cells drawn from amniotic fluid donated by pregnant women hold much of the same promise as embryonic stem cells.
"In 2000, the NIH, under the administration of President Bill Clinton, issued guidelines that allow federal funding of embryonic stem-cell research. 
Adult stem cells are undifferentiated cells, found throughout the body after development, that multiply by cell division to replenish dying cells and regenerate damaged tissues.
Also known as somatic stem cells (from Greek Σωματικóς, meaning "of the body"), they can be found in juvenile as well as adult animals and human bodies.
Scientific interest in adult stem cells is centered on their ability to divide or "self-renew" indefinitely, and generate all the cell types of the organ from which they originate, potentially regenerating the entire organ from a few cells.
Unlike embryonic stem cells, the use of human adult stem cells in research and therapy is not considered to be controversial, as they are derived from adult tissue samples rather than human 5 day old embryos generated by IVF (in vitro fertility) clinics designated for scientific research.
They have mainly been studied in humans and model organisms such as mice and rat. 
Stem cells are cells found in all multi-cellular organisms.
They were isolated in mice in 1981, and in humans in 1998.
In humans there are many types of stem cells, each with varying levels of potency.
Potency is a measure of a cells differentiation potential, or the number of other cell types that can be made from that stem cell.
Embryonic stem cells are pluripotent stem cells derived from the inner cell mass of the blastocyst.
These stem cells can differentiate into all other cells in the human body and are the subject of much scientific research.
However, since they must be derived from early human embryos their production and use in research has been a hotly debated topic as the embryo most likely is destroyed in the process.
Stem cell treatments are a type of cell therapy that introduce new cells into adult bodies for possible treatment of cancer, diabetes, neurological disorders and other medical conditions.
Stem cells have been used to repair tissue damaged by disease or age.
Cloning also might be done with stem cells.
Pluripotent stem cells can also be derived from Somatic cell nuclear transfer which is a laboratory technique where a clone embryo is created from a donor nucleus.
Somatic cell nuclear transfer is also tightly regulated amongst various countries.
Until recently, the principal source of human embryonic stem cells has been donated embryos from fertility clinics.
In January 2007, researchers at Wake Forest University reported that "stem cells drawn from amniotic fluid donated by pregnant women hold much of the same promise as embryonic stem cells.
"In 2000, the NIH, under the administration of President Bill Clinton, issued "guidelines that allow federal funding of embryonic stem-cell research."
Thy-1 can be considered as a surrogate marker for various kind of stem cells (e.g.
hematopoietic stem cells or HSCs).
It is one of the popular combinatorial surface markers for FACS for stem cells in combination with other markers like CD34.
During sorting, mouse HSCs fall under Thy1hi subpopulation, while human HSCs fall under the Thy1lo subpopulation.
In humans, Thy-1 is expressed on neurons and HSCs among others.
It is considered a major marker of HSC pluripotency in concordance with CD34.
In human HSCs, Thy1 cells are all CD34 positive.
Thy 1 is also a marker of other kind of stem cells, for example: mesenchymal stem cells, hepatic stem cells ("oval cells"), keratinocyte stem cells, putative endometrial progenitor/(?
)stem cells.