[1] [Online]: http://en.wikipedia.org/wiki/Stem_cell
[2] Becker AJ, McCulloch EA, Till JE (1963). “Cytological demonstration of the clonal nature of spleen colonies derived from transplanted mouse marrow cells”. Nature 197: 452-4.
[3] Siminovitch L, McCulloch EA, Till JE (1963). “The distribution of colony-forming cells among spleen colonies”. Journal of Cellular and Comparative Physiology 62: 327-36.
[6] [Online]: http://en.wikipedia.org/wiki/Adult_stem_cell

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