A selectable marker protects the organism from a selective agent that would normally kill it or prevent its growth.

Antibiotics are the most common selective agents.

More selective agents were sought, although this was theoretically unpromising.

Tetracycline is used in cell biology as a selective agent in cell culture systems.

Ganglionic blockers are used less frequently now than they were in the past, because more selective agents are now available.

Triclosan also has been employed as an effective selective agent in molecular cloning.

(2)The endogenous tolerance leads to the ineffectiveness of the weak selective agents.

The medium contains crystal violet and gentamicin as selective agents to suppress the growth of other bacteria.

Ukrain is promoted as a selective cytotoxic agent against cancer cells.

As the name suggests, it contains cetrimide, which is the selective agent against alternate microbial flora.