G. intestinalis RNase MRP RNA sequence alignment analysis. A. The consensus MRP RNA backbone structure. B. Multiple sequence alignment of CR-1 and CR-5 regions from eukaryotic species showing a high degree of similarity in these regions. C. Multiple sequence/structure alignment of G. intestinalis MRP RNAs from Assemblage A (CH991769:781009-781197), B (ACGJ01002287:25810-25999) and E (contig188:88192-88380). Each stem structure is coded in a different color and positions of nucleotide substitution are indicated by dots.