Full text
PDFPage 4609
. 1985 Jun 25;13(12):4609. doi: 10.1093/nar/13.12.4609
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.