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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Intermediate introns in nuclear genes of euglenids – are they a distinct type?

Fig. 4

RNA secondary structure of introns. a and b Introns at position 1 in tubB genes from E. agilis (strains ACOI 2970 and PO, respectively). c Intron at position 1 in gapC gene from E. gracilis (secondary structure according to [25]). d intron at position 9 in the hsp90 gene from E. agilis strain ACOI 323 (most nucleotides from the middle part omitted and indicated by dots). Exons in black circles, introns in gray; nucleotides present in all six homologous sequences of E. agilis highlighted in red, in five of six in orange, in four of six in yellow. Classical Watson-Crick hydrogen bonding marked by single (AU) or double (GC) lines, non-classical GU pairs by single line with circle

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