Consistent associations have been identified for polymorphisms associated with agouti-related peptide, brain derived neurotrophic factor,
catechol-o-methyl Transferase, SK3 and opioid receptor delta-1.
The GGT test,
also known as Gamma GT or gamma glutamyl Transferase, is usually required to check for liver problems
or biliary obstruction, since in these situations the concentration of GGT is high.
Generality Alanine amino Transferase, more simply known as ALT or SGPT(serum glutamic pyruvic transaminase),
is an intracellular enzyme present in many tissues, especially in striated muscles, in the brain and especially in the liver.