0 a cell, especially one taken from a person or animal in a very early stage of development, that can develop into any other type of cell --
1 a type of cell that is able to divide to produce more cells, or to develop into a cell that has a particular purpose --
Transplantation of limiting dilution numbers of stem cells in a competitive repopulating assay allows a quantitation of the stem-cell-repopulating unit present in a transplanted population.
These early studies are pointing the way to a bright future for ageing research and stem cell biology.
These cycles of growth are thought to rely on the presence of a mammary stem cell population.
Although the group condemned human reproductive cloning, they found acceptable the cloning of human embryos for stem cell research.
As the above analysis has shown, the abundant use of therapeutic arguments to justify human embryonic stem cell research lacks empirical foundation.
A permanent monogamic mating schedule started 43 days after treatment to recover offspring derived from treated stem cell spermatogonia.
Effect of timing of oocyte activation on rat cloning using neural stem cell nuclei (abstract).
The cells of all tissues in the resulting chimeric mice consisted of mixtures o f the two types of cells, including the stem cell population.
