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.
A neighbor joining tree of 799 OR amino acid partial sequences from four vertebrate species (the ratsnake: 92, the anole lizard: 108, human: 387, and chicken: 212). The number of amino acid sites used for the analysis is 77. Bootstrap values of more than 50% are shown on major internal nodes only. The tree is rooted at an arbitrary position on a lineage between class I and class II ORs as indicated by an arrow.
