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Laboratory of Molecular Evolution, Stazione Zoologica Anton Dohrn, 80121 Naples, Italy. mcosta@szn.it
We report here investigations on the isochore pattern and the distribution of genes in the chromosomes of chicken. In spite of large differences in genome size and karyotype, the compositional properties and the gene distribution of the chicken genome are very similar to those recently published for the human genome, which is a good representative of most mammalian genomes. In fact, this similarity, which extends to the relative amounts and, also, to a large extent at least, to the average base composition of isochore families, is most interesting in view of the very large distance of mammals and birds for a common ancestor, which goes back to 310-340 million years ago. This raises important questions about genome evolution in vertebrates.
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