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.
Hypothesis on the origin of viroids, viroid-like RNAs, retroviroids and retrozymes, and the members of the realm ribozyviria (hepatitis delta and delta-like viruses) through a modular evolutionary scenario based on the fusion of replicative modules of protoviroids, deriving from the RNA world, and RNAs of cellular origin.
