Stem cells have classifications, not all cells may be considered alike.
Primary embryonic stem cell is the zygote or egg counts (as well describes his term) with toti potential and the ability to reproduce and generate any type of body tissue or embryo.
As the zygote develops, the cells are engaging in the production of specific tissues and begin to lose totipotency. Hence stem cells arise placenta and umbilical cord, which have enormous regenerative power even later a extrauterine life; retaining the ability to activate them (skin, bone, liver, kidneys, muscles, etc.) differentiated stem cells that are each that will keep our cellular life cycle from birth to adulthood stage.
Throughout life, some types of cells retain the ability to reproduce and generate different cell lines, this is the case of the cells of the blood and adipose tissue (fat), which are known as mesenchymal cells whose characteristics are adaptation and cellular plasticity to repair or regenerate damaged tissues or by oxidation, malnutrition or poor diet, manifestation of some pathological condition (disease), contaminated environment, bodies etc.
Based on multiple protocols developed worldwide using mesenchymal cells, when you can work safely in handling such (adipose and blood) tissues to perform minimally invasive treatments to activate cell regeneration of those patients suffering from autoimmune disease (rheumatoid arthritis, lupus, scleroderma, multiple sclerosis, etc.), chronic degenerative (Types I and II diabetes, asthma, hypertension, renal failure, etc.), as well as those oncological (leukemias, lymphomas) in which They have been checked regenerative benefit of the application of stem cells.