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 Bird Lover The Bird Lover The Bird Lover, also known as The Prince as Bird, is a type of narrative structure in folklore, no. 432 in the Aarne–Thompson classification system. In the typical version of story, a woman acquires a bird lover—a nobleman in the shape of a bird—who is wounded by means of a trap set by the woman's husband, such as a set of sharp points set up outside the woman's window. She follows the wounded bird's trail, cures him, and then marries him. An example of the motif is found in one of Marie de France's "Lais", "Yonec", though