21.   Fortunately, the regions contain few genes.

22.   Its advantage is that it is easy to see if it is active because the cells containing the gene glow under a fluorescent light.

23.   Many of the most promising modern vaccines depend on viruses to transport genes into the body, and contain genes that directly alter the immune response.

24.   Monsanto, the leader in agricultural biotechnology, also said that it had sued Mycogen and Ciba-Geigy, which market corn containing the gene.

25.   Only about one out of five animals that contain the gene use it efficiently enough to be useful, Colman said.

26.   Only about one in a million of this subset of helper cells, a group known as memory cells, contain HIV genes, Siliciano finds.

27.   Scientists have demonstrated in the lab that enterococci can transfer rings of DNA called plasmids, which contain resistance genes, to staph aureus.

28.   Scientists in San Francisco revealed they are breeding pigs that contain human genes.

29.   The fifth track from the top, containing known genes, holds the full sequence of the Werner gene.

30.   The seed contains a gene developed by St. Louis-based Monsanto Co. that causes cotton plants to resist several major pests.