Segawa Syndrome, Autosomal Recessive, also known as tyrosine hydroxylase deficiency, is related to myotonia congenita, autosomal dominant and alexithymia, and has symptoms including muscle rigidity, tremor and abnormality of extrapyramidal motor function. An important gene associated with Segawa Syndrome, Autosomal Recessive is TH (Tyrosine Hydroxylase). Affiliated tissues include eye and brain, and related phenotypes are ptosis and ataxia