So it produced antibody system is to produce antibody from mammalian cell whose post is not found, the translation movement movement in cells, bacteria or yeast.
The system is commonly used to produce antibodies from mammalian cell production of antibodies, which are post translation movement, this movement will not be found in bacteria or yeast cells.
So the popular system used to produce antibodies, antibody production was from mammalian cell which process post translation by won't find this process in cell bacteria or yeast.