protien export from the cell is an example of
Protein production The oldest and most widely used expression systems are cell-based and may be defined as the "combination of an expression vector, its cloned DNA, and the host for the vector that provide a context to allow foreign gene function in a host cell, that is, produce proteins at a high level".[9][10] Overexpression is an abnormally and excessively high level of gene expression which produces a pronounced gene-related phenotype.[11][12]