He has also identified several cases of horizontal gene transfer.

They have also been found in bacteria, where their presence is thought to be due to horizontal gene transfer.

When genes are inserted, they usually come from a different species, which is a form of horizontal gene transfer.

This is theoretically possible under principles of "horizontal gene transfer."

Artificial horizontal gene transfer is a form of genetic engineering.

This actually also happens, though very rarely in higher organisms (see horizontal gene transfer).

There is evidence for historical horizontal transfer of the following genes:

Most likely, they were acquired through horizontal gene transfer from viral hosts.

In certain bacteria, mobile genetic elements and horizontal gene transfer.

A recent acquisition by horizontal gene transfer would be unlikely to have integrated itself to this degree.