Licensing fees slow advance of stem cells.
D035843:Biomedical Research / Q000191:economics* / Q000639:trends*; D004622:Embryo, Mammalian / Q000166:cytology; D005249:Fees and Charges; D006801:Humans; D008004:Licensure / Q000191:economics*; D010330:Patents as Topic; D013234:Stem Cells; D013997:Time Factors; D014481:United States