There has been an X linked recessive form of Ectodermal Dysplasia reported in a German Shepherd Dog and subsequent research colony. (vetgen.com)
Researchers from the Perelman School of Medicine at the University of Pennsylvania who study an inherited disorder of skin, hair follicles, nails, sweat glands, and teeth called hypohidrotic ectodermal dysplasia (HED) have identified a mechanism that may also be disrupted in male pattern baldness, a more common condition. (sciencedaily.com)
Both groups report that a strand of rapidly dividing cells on the tip of the growing vertebrate limb, called the apical ectodermal ridge (AER), arises exactly on the border between cells that switch on R - fng and those that don't. (sciencemag.org)