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The evolution of the GC (guanine cytosine) content at the third codon position of the histone genes ( H1 , H2A , H2B , H3 , H4 , H2AvD , H3.3A , H3.3B , and H4r ) in 12 or more Drosophila species is reviewed. For explaining the evolution of the GC content at the third codon position of the genes, a model assuming selection with a deleterious effect for adenine/thymine and a size effect is presented. The applicability of the model to whole-genome genes is also discussed.

The Adenine/Thymine Deleterious Selection Model for GC Content Evolution at the Third Codon Position of the Histone Genes in Drosophila