Abstract
Pluripotency refers to the capacity of single cells to form derivatives of the three germ layers-ectoderm, mesoderm, and endoderm. Pluripotency can be captured in vitro as a spectrum of pluripotent stem cell states stabilized in specialized laboratory conditions. The recent discovery that pluripotent stem cells can colonize the embryos of distantly related animal organisms could, with further refinement, enable the generation of chimeric embryos composed of cells of human and animal origin. If achievable, the production of human-animal chimeras will open up new opportunities for regenerative medicine, facilitating human disease modeling and human organ generation inside large animals. However, the generation of human-animal interspecies chimeras is anticipated to require human chimera-competent pluripotent stem cells. Thus, it remains imperative to examine the pluripotency continuum more closely in light of advances that will facilitate the production of human-animal chimeras. This piece will review the current understanding of the pluripotency continuum and interspecies chimeras. © 2019 by John Wiley & Sons, Inc.
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