knowledge -WSS

knowledge

author：knowledge 2025-10-02 07:05:45 - browse：5

Dolly sheep — Alex Hogan/STAT, Getty Images

Dolly, the first animal to be cloned from an adult of its species, was born 20 years ago today at the Roslin Institute in Scotland. When her creators announced what they had done, it triggered warnings of rich people cloning themselves for spare parts, of tyrants cloning soldiers for armies, of bereaved parents cloning their dead child to produce a replacement — and promises that the technique would bring medical breakthroughs. Which raises some questions:

Why are there no human clones?

Because of scientific, ethical, and commercial reasons.

The scientists who created Dolly — named after Dolly Parton, naturally — removed the DNA from a sheep ovum, fused the ovum with a mammary epithelial cell from an adult “donor” sheep, and transplanted the result, now carrying DNA only from the donor, into a surrogate ewe. But that technique, called somatic cell nuclear transfer (SCNT), turned out not to be so easy in other species.

Get unlimited access to award-winning journalism and exclusive events.

Subscribe Log In

Previous article： Alkermes shareholders re
Next article： FDA’s Peter Marks seems inclined to back Sarepta’s gene therapy

entertainment

WSS

Eye stem cell transplant could help restore vision in injured people

Clinical trials must include more disabled people

The SUPPORT Act is critical to fighting the opioid crisis

As JPM 2024 winds down, some health tech firms project optimism

Risky weight loss products often used by teens globally, per study

Health and fitness trackers are measuring the wrong things

knowledge

knowledge

Why are there no human clones?

leisure time

Trump demands the U.S. pay no more for drugs than other countries … again

FDA approves first treatment for ultra

Medicare details structure of new drug price negotiation program

Fauci’s Covid grilling leads GOP to weigh foreign research rules

How to save PrEP access — and even expand it

Ukraine taking heavy casualties 10 weeks into its counteroffensive

Malaria cases in Florida and Texas: Here’s what you need to know

Ukraine taking heavy casualties 10 weeks into its counteroffensive

Wildfire smoke exposes gaps in outdoor worker protections

Vaccine critic Robert F. Kennedy Jr. says he'll chair Trump vaccine panel

knowledge

JPM 2024: Nvidia claims we're in biological revolution. Are we?

Liz Cheney makes 1st public comment since Trump's election interference indictments

Clinical trials must include more disabled people

New menopause drug shows promise in relief for hot flashes

JPM 2024: Nvidia claims we're in biological revolution. Are we?

Readout LOUD podcast: FTC v. biotech, future of Pfizer and Vertex

focus

entertainment

hotspot

explore