An adult cell from the mammary gland of a Finn - Dorset ewe acted as the nuclear donor; it was fused with an enucleated egg from
a Scottish Blackface ewe, which acted as the cytoplasmic (or egg) donor.
Wilmut and his colleagues transplanted a nucleus from a mammary gland cell of a Finn Dorsett sheep into the enucleated egg of
a Scottish blackface ewe.
They transferred 277 nuclei from the mammary cell line — from a white - faced breed known as a Finn Dorset — into eggs from the hardy
Scottish blackface breed.
The first sample showed a strong affinity with northern Britain, specifically the region in which current black - faced breeds such as Swaledale, Rough Fell and
Scottish Blackface are common.