Although the Del(9)olt1Pas mutation is a large deletion on chromosome 9 encompassing the genes Ctdspl (carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase-like), Vill (villin-like), Plcd1, Dlec1 (deleted in lung and esophageal cancer 1), Acaa1b (acetyl-Coenzyme A acyltransferase 1B, synonym thiolase B), and a part of Slc22a14 (solute carrier family 22 member 14), the alopecia of the mutant has been attributed to the loss of Plcd1[47]. Here, VILL is linked to medical procedure.