Silkie the "SHH" gene, called the ZPA Regulatory Sequence (ZRS). This causes ectopic "SHH" expression in the anterior of the developing limb bud, leading to increased tissue growth and digits. While the feet of the Silkie display polydactyly, the wings have the standard tridactyly (three digit) arrangement. The Japanese Silkie initially develops additional digits in the wing as an embryo, but these are lost prior to hatching. The genetic cause behind Silkie polydactyly differs from those that cause polydactyly in the Dorking chicken breed, which is due to ectopic "FGF4" expression in the AER, with ectopic "SHH" a secondary effect. The
The Great Silkie of Sule Skerry August, 2012. American folksinger Pete Seeger set the poem "I Come and Stand at Every Door" by Turkish poet Nazim Hikmet to the tune of "The Great Silkie" in 1953. The Great Silkie of Sule Skerry "The Great Silkie of Sule Skerry" or "The Grey Selkie of Sule Skerry" is a traditional folk song from Shetland and Orkney. A woman has her child taken away by its father, the great selkie of Sule Skerry which can transform from a seal into a human. The woman is fated to marry a gunner who will harpoon the selkie and their son. "The