I am constructing lenti-vector, what is the difference between bi-directional promoter and dual promoter in opposite direction?
![CMV Promoter based Lenti-Easy HA Tag Vector (HIV) plus Lenti-Combo packaging plasmid mix, 10 ug vector and 100 ug packaging plasmid mix CMV Promoter based Lenti-Easy HA Tag Vector (HIV) plus Lenti-Combo packaging plasmid mix, 10 ug vector and 100 ug packaging plasmid mix](https://www.biocat.com/bc/img/info_pix/pLenti-Easy-HA.gif)
CMV Promoter based Lenti-Easy HA Tag Vector (HIV) plus Lenti-Combo packaging plasmid mix, 10 ug vector and 100 ug packaging plasmid mix
![Efficient production of a lentiviral system for displaying Crimean-Congo hemorrhagic fever virus glycoproteins reveals a broad range of cellular susceptibility and neutralization ability | SpringerLink Efficient production of a lentiviral system for displaying Crimean-Congo hemorrhagic fever virus glycoproteins reveals a broad range of cellular susceptibility and neutralization ability | SpringerLink](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs00705-020-04576-9/MediaObjects/705_2020_4576_Fig5_HTML.png)