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Variation in the P6b region of tRNALeu (UAA) intron sequences of Nostoc in Nephroma. The dotted line separates bipartite Nephroma species (genotypes A–G) from tripartite N. arcticum (genotypes Y and X), while the dashed line divides Class 1 from Class 2 repeat motifs. The four indel sequence elements in Class 1 are colored with their insertion points indicated by *, **, ***, or ∧∧
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