The Lazarus Project team says they have been able to recover cell nuclei of the extinct gastric-brooding frog, Rheobatrachus silus,
from tissues collected in the 1970s and kept for 40 years in a conventional deep freezer.
The genome of
Rheobatrachus silus, extinct since 1983, has been revived and reactivated by a team of scientists using
somatic cell nuclear transfer
to implant a "dead" cell nucleus into a fresh egg from another frog species.
Rheobatrachus silus is famous for swallowing its eggs, brooded its young in its stomach and giving birth through its mouth. The "de-extinction" project aims to bring the frog back to life.