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Phylogenetic analysis of the internal sequences. The phylogeny was investigated by using the NJ method and the Kimura two-parameter model (a) and by performing an ML analysis and a K80 model test (b) of a consensus alignment of internal sequences. The two intragroup clusters (types 1 and 2) are indicated by blue and red lines, respectively, whereas the additional distribution of type 1 elements in two subtypes (1a and 1b) is indicated by squares.
