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'''Human T-lymphotropic virus 2''' ...that is known to cause a type of [[leukemia]] and [[lymphoma]] called HTLV-2-associated myelopathy/tropical spastic paraparesis (HAM/TSP).

* [[ABO blood groups]] - The system by which human blood is classified, based on proteins occurring on red blood cells; the fo ...ired immunodeficiency syndrome]] - infection by the human immunodeficiency virus (HIV), which causes a weakening of the immune system