Figure 3. Relative positions of introns in the T2/S-type RNases of the three classes of land plants, algae, and several fungal and animal species and their numbers in some of the sequenced genomes (a star next to a number indicates that the sequence was incomplete or the genome was in the early stages of assembly and the actual paralog count may be lower).

Numbers listed below algal gene structures represent 11 intron positions present in land plants. Numbers between exons represent intron phases. Numbers in parentheses represent the number of sequences with the specific intron patten in our dataset. Pattern III-B^* contains a single intron at position 9. This pattern has no EST support and was predicted based on genomic sequences from Fragaria nubicola and Fragaria vesca.