Viroids
as
Abnormal
Host
RNAs -
.
According
to
this
interpretation
viroids
may
be
abnormal
host.
RNAs,
RSTV,
and
presumably
other
viroids,
may
have
originated
from
nuclear
RNAs.
This
RNA
became
pathogenic
either
by
mutation
or
by
chance
introduction
into
a
foreign
species.





