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Variable regions in aligned 18S rRNA sequences from the C. parvum Iowa isolate (GenBank accession no. AF164102 [2]) and isolates WH33 (W17), WH37 (W17), WH3 (cervine), and WH5 (cervine variant) from the present study. The ruler measures the distance (in nucleotides) from the beginning of the 18S rRNA gene in the Iowa isolate.
