On Apr. 23, 2015, researchers announced that mammoth teeth preserved in eastern Siberian permafrost produced the oldest ancient DNA on record, pushing the technology close to ﾗ but perhaps not past ﾗ its limits.

Genomic DNA extracted from a trio of tooth specimens excavated in the 1970s identified a new kind of mammoth that gave rise to a later North American species. The findings were published in Nature.