of National Institutes of Health
Photographer Bill Branson.
The Age of
in Japan believe they've found a link between cloning and aging.
The study compared cloned mice and conventionally reproduced mice.
The cloned mice died earlier than their counterparts. The finding
raised concerns that a cellular structure related to aging may be
abnormal in clones. The size of the Japanese study was very small,
but will prompt other research into the "age" of clones.