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.
PCR amplification of the mitochondrial atp1 gene, here exemplarily shown for a DNA sampling of nine Pteridaceae species and the Pteris cretica cDNA. The different product sizes indicate variable presence of intron atp1i361g2, subsequently confirmed by cloning and sequencing.
