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.
Duplication rates are stimulated by recB mutations in a recA mutant strain. Addition of a recB mutation causes a small increase in the purHD duplication rate in strains lacking recA. In recA mutants, duplications may form entirely by single-strand annealing. Absence of RecB may leave undigested rrn sequences at double-strand breaks, enhancing the likelihood of duplication by annealing.
