Skip to Content

A cell that does it all

For 25 years, embryonic stem cells have been promising and controversial in equal measure. How far have they really come?

August 23, 2023
July/August 1998 cover of MIT Technology Review
A moody 1998 cover of MIT Technology Review predicted the arrival of embryonic stem cells—and of an ethical controversy.Robert Cardin

From “The Troubled Hunt for the Ultimate Cell” (1998), by Antonio Regalado: “If awards were given for the most intriguing, controversial, underfunded and hush-hush of scientific pursuits, the search for the human embryonic stem (ES) cell would likely sweep the categories. It’s a hunt for the tabula rasa of human cells—a cell that has the potential to give rise to any of the myriad of cell types found in the body. If this mysterious creature could be captured and grown in the lab, it might change the face of medicine, promising, among other remarkable options, the ability to grow replacement human tissue at will … [but] these cells are found only in embryos or very immature fetuses, and pro-life forces have targeted the researchers who are hunting for ES cells, hoping to stop their science cold. In addition, the federal government has barred federal dollars for human embryo research, pushing it out of the mainstream of developmental biology. To make matters worse, human ES cells could conceivably provide a vehicle for the genetic engineering of people, and the ethical dilemmas surrounding human cloning threaten to spill over onto this field.”

Update from the author (2023): The debate lasted years, but science prevailed over religion in the stem-cell wars of the early 2000s. Now research on ES cells is paid for by the US government. Yet biology keeps offering surprises. The latest? Research shows stem cells in the lab can self-assemble back into “synthetic” embryos, shockingly similar to the real thing. And that’s the next debate.

Deep Dive

Biotechnology and health

What to know about this autumn’s covid vaccines

New variants will pose a challenge, but early signs suggest the shots will still boost antibody responses.

A biotech company says it put dopamine-making cells into people’s brains

The experiment to treat Parkinson’s is a critical early test of stem cells’ potential to tackle serious disease.

Tiny faux organs could crack the mystery of menstruation

Researchers are using organoids to unlock one of the human body’s most mysterious—and miraculous—processes.

How AI can help us understand how cells work—and help cure diseases

A virtual cell modeling system, powered by AI, will lead to breakthroughs in our understanding of diseases, argue the cofounders of the Chan Zuckerberg Initiative.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at with a list of newsletters you’d like to receive.