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FIG. 1. Sequence alignment of M. fructicola ribosomal SSU intron and the nucleotide insertion/substitutions for each intron type characterized. The nucleotides shown are the intron sequence originally characterized by Fulton and Brown (1997), type A. The boxes are the group I intron internal elements P, Q, R, S (Waring and Davies 1984). Nucleotide variations from the original sequence are indicated for each polymorphic type. Identical nucleotides are represented by dots, and absent nucleotides are shown by hyphens. Primers used for PCR assays and sequence analysis in this study are indicated in boldface. The primers are designated by both the original published names (NS5, White et al 1990; mfs-3, Fulton and Brown 1997) and following the nomenclature of Gargas and DePriest (1996).
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