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 Silkie (novel) Nijjan, he can imagine any kind of Universe and bring it into being. He decides to imagine one without the Nijjans, the Glis or the Kibmadine. He restores the Earth to its place in orbit around the Sun, also decides to make all humans into Silkies, abolishing the divisions threatening to tear the Earth apart. He then enters this universe and re-joins his people, and especially his wife. The Silkie (novel) The Silkie is a fix-up science fiction novel by A. E. van Vogt, first published in complete form in 1969. The component stories had previously been published in "Galaxy