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.
Two types of autointegrations. (A, B) Concerted autointegrations. A 5-bp duplication of viral sequence is indicated by a black oval. (C) One-end autointegration. U3 is indicated by a light-gray line; R is indicated by a black box; U5 is shown by a dark gray box. The cassette is indicated by a box with slashes.
