| http://www.w3.org/ns/prov#value | - While protein expression has not been demonstrated on these last three tissues, ESTs (expressed sequence tags) derived from human tissues such as retina, pancreatic islets, and placenta matching the AC133 gene sequence are present in Genebank.41 Therefore, although progenitor cells coexpress these two early antigens, they appear to share no other known relationship, as the function of either molec
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