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.
Phylogenetic relationships of gnathostomes inferred from the molecular markers identified in this study. Arrows indicate the timing of deletions and insertions of amino acids, alternative splicing, and “gain” or “loss” of introns. DM20 transcripts are found in all taxa except amphibians. The rhodopsin gene from ray-finned fishes, with the exception of bichir, is intronless.
