Kevin Sinclair and Dolly "sisters"
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Dolly sisters are 'perfectly normal'

Dolly the sheep's "siblings" are generally healthy, a study has shown, providing hope that cloning can yield animals free from degenerative illness.

The scientist who's led the investigation into the clones - Prof Kevin Sinclair from Nottingham University - spoke with our correspondent Jonathan Amos.

  • 27 Jul 2016