Hence, the virus adopted the name “Human T-cell leukemia” and the disease “adult T-cell leukemia.” Around this time, a genetically related (70% structural similarity to HTLV-1) virus was identified in association with a CD8 T-cell variant of a hairy cell leukemia (Kalyanaraman et al., 1982) and this virus was added to the group as HTLV-II. Here, CD8A is linked to T-cell leukemia.