Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Plasmid selection and maintenance by Operator Repressor Titration. Note of a: An essential gene is repressed by a genome encoded repressor. Plasmid containing several sequences of the operator can titrate this repressor by competition, allowing essential gene expression. GoI: Gene of Interest; ori: Origin of replication.
