???? ???? ??? ??? ?? ??? ??? ???? ????,????,???? ?? ?? ??? ?? ?? ???? ??? ?? ? ?? ? ??? ??????. ?? ??? ????? ?????.Trichothiodystrophy, generally identified as TTD, can be a uncommon inherited ailment that impacts several areas of the human body. The hallmark of the issue is hair that is certainly sparse and easily broken. [from MedlinePlus Genetic