pFLAG-CMV-4 is a 6.2 kb expression vector used for transient or stable expression in mammalian cells. The vector is a derivative of pCMV5 used for transient or stable expression of a properly inserted open reading frame as an N-terminal Met-FLAG fusion protein.
The pFLAG-CMV-4 Expression Vector is a shuttle vector containing both bacterial and SV40 origins of replication for propagation in both E.coli and mammalian cells. 
Efficiency of replication and genomic integration is optimal when using host cells that express the SV40 large T antigen.
The FLAG epitope is a small, hydrophilic 8 amino acid tag (DYKDDDDK) that provides for sensitive detection and high quality purification using ANTI-FLAG products available for Sigma Aldrich. 
pFLAG-CMV-4-BAP Control Plasmid is a 7.7 kb derivative of pCMV5 used for transient intracellular expression of N-terminal Met-FLAG bacterial alkaline phosphatase fusion protein in mammalian cells.

Principle
The promoter-regulatory region of the human cytomegalovirus2 drives transcription of FLAG-fusion constructs. The aminoglycoside phosphotransferase II gene (neo-r) confers resistance to aminoglycosides such as G 418 allowing for selection of stable transfectants.