Table 3.

Cumulative Information for Positions -32 to +32

Intron length	Site	Information (random)a	Information (genomic)b	Relative entropyc
64−80	D	9.57	9.14	9.24
64−80	A	10.00	9.58	9.15
All	D	9.64	9.23	9.10
All	A	10.15	9.76	9.23
>8191	D	11.80	11.00	11.61
>8191	A	14.27	13.48	14.22

^aInformation relative to random nucleotide frequencies: 25% A, C, G, T

^bAbsolute differences between information relative to random nucleotide frequencies and background information computed from Drosophila genomic nucleotide frequencies (28.8% A, T; 21.2% G, C). The sampling error (See Appendix 2) is also subtracted, but the final value is not allowed to be negative

^cRelative entropy based on the Drosophila genomic nucleotide frequencies with no correction for sampling error