The majority of bacteria may have evolved on land from an early common ancestor, according to an analysis by two US scientists. The relationships between different families of bacteria has long been contentious. Traditionally, phylogenetic trees that show how bacteria are related to each other have been based on two different techniques, each yielding different results. One tree is built by comparing the genes encoding ribosomal RNA, whereas the other method uses 20–40 core genes. (source: nature.com)
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