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Retroviridae family comprises seven major genera: alpha-retroviruses (prototype ALSV), beta-retrovirus (prototype MMTV), delta-retrovirus (prototype HTLV-I, HTLV-II), gamma-retrovirus (prototype MLV), epsilon-retrovirus (prototype WDSV), lentiretroviruses (prototype HIV-1), and spumaviruses (prototype SFV). Notable characteristics of the viruses are included.
