Wednesday, 1 August 2012

What are the types of stem cells(continued)

Here is a current list of the sources of stem cells based on source of collection:
1.      Embryonic stem cells - are harvested from the inner cell mass of the blastocyst seven to ten days after fertilization.
2.      Fetal stem cells - are taken from the germline tissues that will make up the gonads of aborted fetuses.
3.      Umbilical cord stem cells - Umbilical cord blood contains stem cells similar to those found in bone marrow.
4.      Placenta derived stem cells - up to ten times as many stem cells can be harvested from a placenta as from cord blood.
5.      Adult stem cells - Many adult tissues contain stem cells that can be isolated.

What are the types of stem cells

Stem cells can be classified into three broad categories, based on their ability to differentiate. Toti potent stem cells are found only in early embryos. Each cell can form a complete organism (e.g., identical twins). Pluri potent stem cells exist in the undifferentiated inner cell mass of the blastocyst and can form any of the over 200 different cell types found in the body. Multi potent stem cells are derived from fetal tissue, cord blood and adult stem cells. Although their ability to differentiate is more limited than pluri potent stem cells, they already have a track record of success in cell-based therapies.

What is stem cells

Stem cells are multi potent cells which has properties to grow into any form of tissues of body under influence of natural process or lab/research driven techniques.
It is pertinent to know the difference between cells & tissues.Where is smallest unit of living plants or organisms is cell. Tissues are collection of similar kind of cells specialized in unique functions both anatomically & physiologically e.g. Liver tissue, heart tissue, brain tissues etc.