Main application fields: A: Good speciality, strong appetency, can be used as probe in nere transmitter receptor tissues and special position in cells. B: Can be used in abruption and purification special nerve transitters. C: Good stability, has many specieses and broad sources, easy crystallization, distinguished mode in relationship research between structure and effect. D: Strong immunity function with little mol wt, can be used in relationship research
between antigen structure and immunity. E: Important tool in probe into transfer process of nerve signals and other nerve activities.