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We have isolated and sequenced the genes for the trans-spliceosomal U6 small nuclear RNAs (snRNAs) from the trypanosomatid species Leishmania mexicana (Lm) and Phytomonas sp. (Ps). Compared with the Trypanosoma brucei (Tb) U6 snRNA, the Lm U6 snRNA contains only a single additional G-C bp in the 5 terminal stem-loop. In contrast, the Ps U6 snRNA sequence contains a G → C change at the last nucleotide...