| http://www.w3.org/ns/prov#value | - XB4 fusion protein, HOXB4-PTD, is added every 2 days to the media.In certain embodiments, the hemangioblasts can be expanded in the presence of any other growth factors or proteins that are present in an amount sufficient to expand such cells.Hemangioblasts obtained from any source, including human or non-human ES cells, bone marrow, placenta or umbilical cord blood, peripheral blood, or other tis
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