Hens that do not produce their own chicks have been developed for use as surrogates to lay eggs from rare breeds.
The advance — using gene editing techniques — could help boost breeding of endangered birds as well as improve production of commercial hens, researchers reported.
A team led by the University of Edinburgh's Roslin Institute in the U.K. used a genetic tool called TALEN to delete a section of chicken DNA. They targeted part of a gene called DDX4, which i
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