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.
—tRNA genes in Selaginellaceae and other lycophytes. Black box represents tRNA genes with two copies, gray box represents tRNA genes with one copy, and white box represents tRNA gene loss. note.—The taxa in the figure is sorted based on the phylogeny of figure 1.
