FIG. 2.

CKS17 nucleotide tree. A phylogenetic tree of a set of 110 nucleotide sequences positive for the CKS17d motif is shown, with the RSV sequence as an outgroup. This tree was determined by the neighbor-joining method with branch lengths proportional to the degrees of divergence between the sequences. Percent bootstrap values obtained from 100 replicates are indicated on the branches only when they are >50%. The names of the sequences correspond to the GenBank identifiers. The sequences retained for the TM alignment are indicated by larger characters. The HERV families or retrovirus types are indicated.