Southern blot analysis. (A) Southern blot analysis of HTLV-1 integration in 11 of 13 cases. (B) Southern blot analysis of TCRγ rearrangement. Arrows indicate the 8.00- and 4.9-kb germline bands. Arrowheads indicate the 6.8- and 2.9-kb rearrangement bands. G indicates a germinal allele; R, rearrangement allele; G/R, rearrangement of one allele; R/R, rearrangement of both alleles.