Harvesting of stem cells from a blastocyst with a pipette.
Stem cells are cells that show now (or very littel) differentiation and therefore aren't determined in their funtion inside the organism.
Stem cells can divide into further stem cells or via differentiation into specialized cells.
Two central forms of stem cells are classified after their origins.
Most adult organisms still have stem cells, called adult stem cells. Stem cells from embryos are often only called stem cells.
Adult and embryonic stem cells differ in their level of differentiation.
After their ability to differentiate into different cell types, stem cells can be divided into:
