10/7/2023 0 Comments Vitamin d video blonde![]() “I showed the embryos to Dr Kingsley before I went home that day and we were very excited,” says Guenther. When Guenther inspected the embryos closely she could see the enzyme’s blue precipitate within their hair follicles, leading her to conclude that the DNA sequence she added played a crucial part in hair follicle development. ![]() She fused the sequence with another piece of DNA that encodes for an enzyme and injected the linked pieces into mouse embryos, which incorporated the DNA in their chromosomes. Guenther copied sequences of human DNA near a gene called KITLG. The not-yet-fully-formed mice looked like tiny Portuguese men o’ war – bulbous, translucent and speckled blue at the edges. A few weeks after preparing them, Dr Catherine Guenther checked her mouse embryos and knew that she had identified the source of a blond-haired mutation in human DNA.
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