1. Volume 13, Issue 24, Pages 2170-2174 (December 2003)
Evidence of Splice Signal Migration from Exon to Intron during Intron Evolution 
Alexander V. Sverdlov, Igor B. Rogozin, Vladimir N. Babenko, Eugene V. Koonin 
Current Biology 
Volume 13, Issue 24, Pages (December 2003)
DOI: /j.cub

2. Figure 1
Information Content in the Regions Surrounding Splice Sites of Old and New Introns
(A) All analyzed introns pooled together.
(B) Introns separated by phases.
(C) Difference in information content between old and new introns of different phases.
The break between the sequences surrounding the donor and acceptor splice eliminates most of the intron sequence. Vertical axis, information content in bits.
Current Biology  , DOI: ( /j.cub )

3. Figure 2
The Nucleotide Composition (Sequence LOGOs) of the Positions Adjacent to Splice Sites in Old and New Introns
Vertical axis, information content in bits.
Current Biology  , DOI: ( /j.cub )