Figure 1.

Phylogenetic network of TBEV clusterons constructed on the basis of the sequences of the E protein fragment for all three subtypes. Three domains corresponding to the TBEV subtypes as well as relationships between all clusterons are shown. Clusterons are designated as described in the text and transition points by numbers in bold (see Results). *Sequence of the unique strain 179-78, being proposed as the fourth TBEV subtype, is included in the analysis to show its relationships with clusterons.