Figure 1.
Blockage of replication fork movement and the possible unwinding of leading and lagging daughter strands to form a four-stranded DNA structure. 3′ ends of DNA strands are indicated by arrowheads.
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.