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. 2019 Apr 29;12(2):65. doi: 10.3390/ph12020065

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Timeline of embryonic stem cell (ESC)-based research. ICM: inner cell mass; OPC: oligodendrocyte progenitor cells; iPSCs: induced pluripotent stem cells; hESCs: human embryonic stem cells; ECCs: embryonal carcinoma cells.