A lack of proven commercial success and a surfeit of ethical, legal and political problems make stem cell companies a difficult pitch to venture capitalists.
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Giebel, L. Stem cells—a hard sell to investors. Nat Biotechnol 23, 798–800 (2005). https://doi.org/10.1038/nbt0705-798
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DOI: https://doi.org/10.1038/nbt0705-798