An expression vector for the expression of an exogenous gene in an animal cell, which contains a chick -actin gene promoter and a restriction enzyme site for incorporating an exogenous gene at the downstream of said promoter and a process for expressing an exogenous gene, which comprises incorporating said exogenous gene into the expression vector at the restriction enzyme site for incorporating the exogenous gene, introducing said vector into an animal cell and culturing the obtained transformed animal cell. The expression system of the present invention can be applied to an expression of any exogenous gene and has an extremely high expression efficiency and is applicable to a wide range of host cells, and hence can sufficiently be utilized for industrial-scale production of a useful material.
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