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.
Three classes of epigenetic variation. Variation of DNA methylation results in the formation of tandem repeats (“Obligatory”). Demethylation is observed in hypomethylated mutants such as ddm1 (“Facilitated”). Natural variations in DNA methylation levels even without any DNA sequence differences between lines (“Pure”).
