Classical Homocystinuria, also known as cystathionine beta synthase deficiency or CBS deficiency,[1] is an inherited disorder of the metabolism of the amino acid methionine, often involving cystathionine beta synthase. It is an inherited autosomal recessive trait, which means a child needs to inherit a copy of the defective gene from both parents to be affected.
Methylmalonic acidemia (MMA), also called methylmalonic aciduria, is an autosomal recessive[1] metabolic disorder.[2] It is a classical type of organic acidemia