horizontal gene transfer Horizontal gene transfer horizontal gene transfer horizontal gene transfer horizontal gene transfer horizontal gene transfer horizontal gene transfer horizontal gene transfer Citizendium:Horizontal gene transfer Horizontal gene transfer horizontal gene transfer http://en.citizendium.org/wiki/Horizontal_gene_transfer http://en.citizendium.org/wiki/Horizontal_gene_transfer horizontal gene transfer horizontal gene transfer Horizontal gene transfer horizontal gene transfer horizontal gene transfer Citizendium:Horizontal gene transfer horizontal gene transfer "Horizontal gene transfer", article a Citizendium