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.
Different criteria for defining universally conserved genes. When 1000 genomes are compared via comparative genomics, the number of orthologous genes falls to 0 (left), but this number can increase to about 500 persistent genes by comparing orthologs that belong to a quorum of a similar or different genomes from evolutionarily distinct bacteria, above a threshold computed using a measure that retains frequent genes that tend to cluster together (right).
