The salivary basic tail and 18.3 kDa proteins of Rhipicephalus sanguineus. A) Clustal alignment with other tick proteins. The asterisk (*) indicates identical amino acids. B) Phylogram of the alignment. The branches shown in red have bootstrap support above 75%. The bar at the centre indicates 20% amino acid divergence. The R. sanguineus sequences are indicated by a circle, and start with RS-. The sequences obtained from the NR database are indicated by 5 letters (3 from the genus and 2 from the species name) followed by the NCBI accession number. Remaining sequences were deduced from dbESTand are available from Francischetti et al. .