Stem cell blood analysis

Stem cell blood analysis

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This image is part of the feature Embryonic Stem Cells

Credit: TEK IMAGE/SCIENCE PHOTO LIBRARY

Caption: Stem cell blood analysis. Technician using a flow cytometer to examine a sample of blood stem cells. The cells have been tagged with a fluorescent antibody to a surface protein (CD 34) found on some blood stem cells. The cells are passed through a beam of light in the cytometer and any fluorescing cells are counted. The stem cells, which are able to develop into any type of blood cell, were harvested from placental and umbilical cord blood. This technique is known as a CD 34+ enumeration assay and determines the concentration of stem cells in a sample.

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