Fig. 3From: High diversity in the regulatory region of Shiga toxin encoding bacteriophagesMaximum-likelihood phylogeny of 260 CI protein sequences. The tree was midpoint rooted and bootstrap values > 80% are indicated by grey circles. The Stx type is shown in the inner ring and the Eru type is shown in the outer ring. Clades that are discussed in the text are labelled with roman numeralsBack to article page