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  • CORRESPONDENCE

Don’t abandon 14-day limit on embryo research, it makes sense

  1. Ronald M. Green

    1. Dartmouth College, Hanover, New Hampshire, USA.

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  2. Michael D. West

    1. AgeX Therapeutics, Alameda, California, USA.

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  3. Leonard Hayflick

    1. University of California, San Francisco, USA.

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As supporters of human-embryo research, we are troubled by the recommendations from the International Society for Stem Cell Research (ISSCR) to allow some in vitro studies of human embryo-like entities beyond the 14-day limit (see go.nature.com/3gfkkw8 and Nature 593, 479; 2021).

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Nature 594, 333 (2021)

doi: https://doi.org/10.1038/d41586-021-01619-2

Competing Interests

The authors declare no competing interests.

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