Figure 2.

Secondary structures of representative group I introns in sponges. The secondary structure of introns 714 (a) is represented by Cinachyrella sp. TAU-M0728 and the first intron of P. onkodes NC_010217. The secondary structure of introns 723 (b) is represented by the sponge C. alloclada TAU-M0293 and the second intron of P. onkodes NC_010217. The secondary structure of intron 870 is represented by T. radiata NMRJ-576.

Szitenberg et al. BMC Evolutionary Biology 2010 10:288   doi:10.1186/1471-2148-10-288
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