FIGURE 1 | The 5 steps of horizontal gene flow.

From the following article:

Horizontal gene transfer: perspectives at a crossroads of scientific disciplines

Barth F. Smets & Tamar Barkay

Nature Reviews Microbiology 3, 675-678 (September 2005)

doi:10.1038/nrmicro1253

Horizontal gene transfer: perspectives at a crossroads of scientific disciplines

Horizontal gene transfer and how it has impacted the evolution of life is presented through a web connecting bifurcating branches that complicate, yet do not erase, the tree of life. The inset illustrates the continuum of 5 steps that leads to the stable inheritance of a transferred gene in a new host.

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