Fig. 8.

(See next page.) Phylogenetic trees for sets of tax open reading frame (ORF) sequences derived from peripheral blood mononuclear cells (PBMC) and bronchoalveolar lavage cells (BALC) from two infected individuals ((a) HTLV-1-associated myelopathy/tropical spastic paraparesis; (b) carrier). The neighbour-joining tree was created using the Kimura two-parameter method [23]. The letters P and B indicate the clones obtained from PBMC and BALC, respectively. Numbers represent the clone numbers. The clones derived from BALC are in squares. ATK-1 tax is a control sequence. The scale bars represent the percentage nucleotide sequence divergence.