See

@article{Stephens.Schneider.Splice,
author = "R. M. Stephens
  and T. D. Schneider",
title = "Features of spliceosome evolution and function
inferred from an analysis of the information at human splice sites",
journal = "J. Mol. Biol.",
volume = "228",
pages = "1124-1136",
year = "1992"}

for an explanation of the interesting biological significance of this observation.

The makelogo program, which creates sequence logos, is freely available as Delila Software.

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