[The progress of expressing vector for mammary gland bioreactor]

The mammary gland bioreactor has great commercial value, but the examples for high level expression of foreign gene were so few that the most examples were not suitable for commercial program. The key resolution for improving the expression level of foreign gene is the construction of expression vector for mammary gland bioreactor. Nearly, many new ideas and new methods about the construction of expression vector were presented, the article summarized them.