The content is available as a PDF (342.2 KB).
. 2002 Mar;128(3):790–792. doi: 10.1104/pp.011020
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.