HAL Deficiency

Crucial
It is feasible that the primary title of the record Histidinemia is not the name you anticipated.

General Discussion
Histidinemia is an unusual genetic metabolic condition identified by a shortage of the enzyme histidase, which is essential for the metabolic process of the amino acid histidine. The bulk of people with histidinemia have no noticeable signs and symptoms that would certainly show that an individual has this problem (asymptomatic).