???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, typically called TTD, is often a unusual inherited condition that influences numerous aspects of the human body. The hallmark of this ailment is hair that is certainly sparse and simply broken. [from MedlinePlus Genetics]?? ??? ????? ??? ??? ????