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Supplemental figure. Comparative alignments of the var intron sequences from rescued plasmids. Dotted regions indicate deleted sequences. Engineered BamHI and NotI sites are underlined, and boundaries of regions 1, 2, and 3 of the intron are overlined. Brackets mark the three central repeats discussed in the text. Alignments were performed using AssemblyLIGN software. Nucleotide numbers 670-672 of the int149 sequence could not be verified from the sequencing electropherograms and are left blank in the alignment.