This strain of tobacco contained an unusually high amount of nicotine, nearly doubling its content from 3.2-3.5% to 6.5%.

The avirulent strain, CMM100, does not contain these plasmids.

The harmless strain also contains about 500 genes not found in O157:H7.

Each strain contained a chemical that inactivated a different gene.

Many strains of A. tumefaciens do not contain a pTi.

Some strains of tuberculosis contain genes that help them neutralize acid, Dr. Gaston said.

Yet more than 3,000 strains of bacteria have already been isolated, and may potentially contain useful new compounds.

Critics say that some food products do not say which bacterial strains they contain nor how much of the ingredient is in each package.

One strain of Ethiopian Coffea arabica naturally contains very little caffeine.

The strain did contain hlyA gene which codes for hemolysin, an endotoxin found in most vibrios.