HEALTHY CLONED MICE AFTER 16 YEARS AT −20°C. “As all of the cells were ruptured after thawing, we used a modified cloning method and examined nuclei from several organs for use in nuclear transfer attempts. Thus, nuclear transfer techniques could be used to “resurrect” animals … without any cryopreservation.”
http://www.pnas.org/content/105/45/17318.short