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. 2016 Sep 7;11(9):e0161476. doi: 10.1371/journal.pone.0161476

Fig 5. Enrichment of in-frame stop codons in introns of Paramecium, Tetrahymena, Ichthyophthirius, Oxytricha, and Stylonychia.

Fig 5

Red and gray boxplots designate O/E values for 3n and 3n±1 introns, respectively. Boxplots were obtained by combining O/E values from 1000 replicates. P-value of stop-codons enrichment was less than 10-4 (by Monte-Carlo 1000-fold simulations) for all introns of Paramecium, Oxytricha, Stylonychia, 41–100 bp long introns of Tetrahymena, and almost all introns of Ichthyophthirius.