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Variations in patterns of scalp hair in children with alopecia. (a) Total alopecia, (b) areas of normal hair adjacent to bald areas, (c and d) different patterns of alopecia despite the children having the same VDR mutation, and (e) child with a full head of hair despite severe hypocalcemia and rickets. Figure from Mol Cell Endocrinol 2011; 347:90–96 used with permission.13
