If various exons (coding areas) of a gene are spliced in diffrent ways, the gene is expressed in different ways.-"On the other hand, the papers show that most alternative splicing events differ widely between even closely related species. "The alternative splicing patterns are very different even between humans and chimpanzees," said Blencowe. "Alternative splicing is evolving faster than gene expression," concluded Tom Cooper, professor of pathology at Baylor College of Medicine in Houston, Texas, who was not involved in the work."(my bold)-http://www.the-scientist.com/?articles.view/articleNo/33782/title/Evolution-by-Splicing/-This is why our DNA and chimp DNA are about 98% similar if one simply tallies coding bases, but the complexity of layers of management in the whole genome makes us very different from the chimp and it is estimated that the genomes are really about 83% similar in action,