Sir
Your News story 'Japan ramps up patent effort to keep iPS lead' (Nature 453, 962–963; 2008) concerned research on human induced pluripotent stem (iPS) cells. For international research on these cells to progress, it is essential to have a thriving research programme on human embryonic stem (ES) cells.
However, the contribution to international research on ES cells between 1980 and 2006 by the United States and China was 20% and 20.8%, respectively, whereas Japan's was only 2.1% (see Japanese Ministry of Economy, Trade and Industry press release at http://tinyurl.com/6lphqw, in Japanese). If the Japanese government insists on having more restrictive regulations for human ES-cell research than other countries (see Nature 438, 263; 2005), Japan is in danger of being overtaken in the field of human iPS-cell research.
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Moriguchi, H., Sato, C. Japan should intensify embryonic stem-cell investigations. Nature 457, 257 (2009). https://doi.org/10.1038/457257c
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DOI: https://doi.org/10.1038/457257c
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