"sensory loss, particularly affecting taste, pain and temperature"
"In familial dysautonomia, a decreased amount of dopamine beta-hydroxylase in the blood is noted leading to recurrent vomiting. Moreover, two mutations of chromosome 9 have been identified, primarily in the IKBKAP gene 6. There is also a decreased number of unmyelinated nerve fibres that is thought to cause a sensory neuropathy 5."