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Maximum likelihood phylogram based on 28 IS66 ORF sequences. A single tree was found (ln = −2,211.39). The accession numbers and contig numbers are indicated. The four positive selected codons are plotted onto the tree using the Baseml program. A vertical line (nucleotide position 70) and an open vertical bar (position 71) mark codon 24. An open circle marks changes in codon 62. An open horizontal bar marks changes of codon 128. An open triangle marks changes at codon 184.
