sources/origin

• CK-MM is mostly in skeletal muscles
• CK-BB is mostly in the brain
• CK-MB is mostly in cardiac muscle
• CK-MT is found between inner/outer membrane of mitochondria; is largely found in the liver, skeletal muscle, and brain
• lactate dehydrogenase is found in heart, liver, kidneys, RBC, lungs, brain, muscle
• AST is widely distributed throughout the body, but found  mostly in the liver, cardiac, skeletal muscle; Also found in smaller amounts in the kidney, pancreas, and red cells
• ALT is widely distributed but is mostly found in the liver
• alkaline phosphatase sources include virtually all human tissue; found in high concentrations in intestine, liver, bone (osteoblasts), spleen, placenta, kidney 
• Acid phosphatase is Most notably found in the prostate gland, but also found in bone, liver, spleen, kidney, RBC, platelets
• GGT sources - kidney, brain, prostrate, pancreas, liver
• amylase is Found in the acinar cells of the pancreas, in salivary glands; secreted into small intestine by pancreas; if it is absorbed in intestine, small enough to be filtered out by glomerulus; can be found in urine
• Lipase comes from the pancreas
• G6PD is found in the adrenal cortex, spleen, thymus, lymph nodes, and red cells