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. 2005 Jan 25;3(2):e42. doi: 10.1371/journal.pbio.0030042

Figure 2. Selective Constraint at the 5′ End of First Introns Plotted against Distance from the Intron Start.

Figure 2

Results for (A) hominids and (B) murids. Segments of 500 bases starting from the 5′ end of intron 1 were analyzed. Bootstrap 95% confidence limits are shown in light grey. Constraint at the 3′ end of first introns is nonsignificant and close to zero in both hominids and murids.