The result gave scientists their first glimpse into the set of genes necessary for life.

"Oncogenes are necessary genes that can also be provoked to cause cancer."

He said he suspects that the people who get lung cancer are born with at least one of the necessary genes altered.

A core clock component gene is a gene necessary for to the pacemaker.

Another gene necessary for synthesis of di-rhamnolipids, rhlC, has also been identified.

Also, genes necessary for intracellular survival as opposed to resistance to killing are not likely to be isolated.

The numerous genes necessary for establishment of competence are located on the bacterial chromosome itself.

Every one of them has the necessary genes.

Also in 2008, Yamanaka et al. found that they could transfer the four necessary genes with a plasmid.

These models can also look at the minimal genes necessary for a cell to maintain virulence.