Intron gain and exon loss and splicing in Euascomycetes snR41-snR70-snR51 polycistronic cluster III.

(A) Intron gain and exon loss in Euascomycetes snR41-snR70-snR51 polycistronic cluster III. snoRNAs are represented schematically by different colored boxes, introns as lines, and exons as gray pillars. (B) Stepwise splicing of snR41-snR70-snR51 polycistronic cluster in Euascomycetes. snoRNAs are represented schematically by different colored boxes, introns as lines, and exons as gray pillars. The 5′ splice site, branch site and 3′ splice site sequences are shown in blue letters for intron III and green letters for intron B.