comprehensive -WSS

comprehensive

author：hotspot 2025-10-02 12:32:22 - browse：6

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： The Supreme Court will review a ruling striking down a domestic violence federal gun ban
Next article： Slovenia has suffered its worst

WSS

Ending health disparities requires full federal government, panel says

Failure, not just success, should guide future doctors

Trump allegedly attempted to have surveillance video deleted: Special Counsel

'Brian's Song' at 50 still offers lessons about cancer for today

Google's generative AI to analyze medical images — and talk to docs

With heat waves through August, officials warn of health risks

focus

comprehensive

Why are there no human clones?

hotspot

Jerome Adams on the need for new antivirals for Covid

CDC: Cases of alpha

Affirmative action in medical school literally saved lives

Judge in Trump's classified documents case questions use of out

Wildfire smoke exposes gaps in outdoor worker protections

VC firm RA Capital starts a new synthetic biology incubator

Drug repurposing or repositioning? The language matters

As the dark side of IVF slowly comes into focus, even more transparency is needed

Psychedelics group wrestles with new pharma identity

Severe weather updates: 1 million customers without power in 11 states as storms pummel East Coast

focus

'The boss' wants server deleted: New allegations emerge in Trump indictment

CDC: Cases of alpha

St. Louis police protesters begin picking up checks in $4.9 million settlement

Mexico finds 491 migrants being held at vacant lot, almost all are from Guatemala

Paxlovid rebound happens. Why and to whom are still a mystery

Slovenia has suffered its worst

leisure time

focus

knowledge

Wikipedia