(A through C) Southern blot analysis of the HTLV-I provirus and T-cell receptor gene rearrangement in human T-cell clones. Genomic DNA digested with EcoRI (A, B) Sac I, or HindIII (C) was hybridized with the probe indicated. All clones except Du35 were infected with HTLV-I. (D) Restriction map of the HTLV-I genome. Numbers indicate the predicted length in kb of restriction fragments.