3964 Nucleic Acids Research, 2006, Vol. 34, No. 14 Figure 5. Information content in the exonic and intronic portions of 50 ss in various organisms. (A) U2-type GT–AG introns. (B) U2-type GC–AG introns. (C) U12-type GT–AG introns. (D) U12-type AT–AC introns. Figure 6. Information content in the exonic and intronic portions of 30 ss in various organisms. (A) U2-type GT–AG introns. (B) U2-type GC–AG introns. (C) U12-type GT–AG introns. (D) U12-type AT–AC introns.