Two of the sheep who resumed hormone production are still "cyclic" after four years, Dr. Arav said by phone from near Tel Aviv.

Human organs for transplant operations are being grown inside sheep and pigs, scientists have revealed. In a world first, more than 50 animals have been implanted with human-animal hybrid embryos.

A small piece of bladder tissue, extracted from prenatal sheep using video-guided surgery, for example, was cultured in the laboratory to produce a much larger segment of bladder tissue.

Swapnil Mishra Updated: Wednesday, April 13, 2022, 10:46 PM IST ...