Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2009 Jun 5;5(6):e1000466. doi: 10.1371/journal.ppat.1000466

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

PMC Copyright notice

The horizontal axis is the proportion of G+C in the first two codon positions (GC1,2), whereas the vertical axis represents the G+C content of the third position (GC3). Substitutions at the third position are usually synonymous and thus are expected to reflect mutational equilibrium in the absence of other evolutionary forces such as codon bias. The two genomes overlap very little in G+C content of genes, and differ more at the third position than at the first two positions.