Simian-T-lymphotropic viruses, also Simian T-cell leukemia viruses (STLVs), are retroviruses closely related to the human sexually and breastfeeding transmissible viruses

HTLV The human T-lymphotropic virus, human T-cell lymphotropic virus, or human T-cell leukemia-lymphoma virus (HTLV) family of viruses are a group of human retroviruses that are known to cause a type of cancer called adult T-cell leukemia/lymphoma an ...

. They have subtypes 1 through 4 as compared to HTLV 1 through 4, and each subtype has its own

serovar A serotype or serovar is a distinct variation within a species of bacteria or virus or among immune cells of different individuals. These microorganisms, viruses, or cells are classified together based on their surface antigens, allowing the epi ...

s. Together they comprise PTLVs (primate T-lymphotropic viruses) A study has shown that STLV-1 Tax and SBZ proteins have similar functions to their counterparts of

HTLV-1 Human T-cell lymphotropic virus type 1 or human T-lymphotropic virus (HTLV-I), also called the adult T-cell lymphoma virus type 1, is a retrovirus of the human T-lymphotropic virus (HTLV) family that has been implicated in several kinds of diseas ...

. STLV-1 is

oncogenic Carcinogenesis, also called oncogenesis or tumorigenesis, is the formation of a cancer, whereby normal cells are transformed into cancer cells. The process is characterized by changes at the cellular, genetic, and epigenetic levels and abno ...

in Japanese macaques. In particular, the HTLV-I/STLV-I history might suggest a simian migration from Asia to Africa not much earlier than 19,500–60,000 years ago.

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* * * * * * * Deltaretroviruses {{virus-stub