March 7 (UPI) -- Scientists found genetic traces of early leukemia ancestors in the genomes of bats. The discovery, detailed in the journal PNAS, fills the "last major gap" in the retrovirus lineage.
According to the new genomic analysis, deltaretroviruses, a family of viruses responsible for a rare type of leukemia, first evolved between 20 and 45 million years ago. The findings confirm the family's ancient animal origins.