???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, normally referred to as TTD, is a unusual inherited ailment that influences quite a few areas of the human body. The hallmark of the ailment is hair that's sparse and easily damaged. [from MedlinePlus Genetics]While you have been browsing a little