Abstract: The present invention relates to the production of proteins in a cell or host cell. The invention uses a TRAnscription Pause (TRAP) sequence to enhance a protein expression characteristic of a protein expression unit. The TRAP sequence is thought to prevent, at least in part, formation of antisense RNA or to, at least in part, prevent transcription to enter the protein expression unit. In one embodiment, the invention provides a method for expression of at least one protein of interest in a cell comprising providing the cell with at least one protein expression unit that comprises a promoter functionally linked to an open reading frame encoding at least one protein of interest, characterized in that the protein expression unit further comprises at least one TRAP sequence and wherein the TRAP sequence is functionally located downstream of the open reading frame and at least in part prevents formation of antisense RNA.