1) Inborn error of metabolism 
Type: Term Pronunciation: lī′si-nē′mē-ă See: hyperlysinemia
[n] - an inborn error of metabolism in which the lack of certain enzymes leads to an inability to metabolize the amino acid lysine
noun an inborn error of metabolism in which the lack of certain enzymes leads to an inability to metabolize the amino acid lysine; characterized by muscular weakness and mental retardation