The other issue I should like to address is the contamination of gene transfer.

He has also identified several cases of horizontal gene transfer.

He said one explanation could be that gene transfer has become more efficient.

Gene transfer between organisms is, as we know, a common phenomenon in nature.

Additional potential cases of lateral gene transfer are also suggested by our data.

This is mostly examined for gene transfer in the nervous system.

Horizontal gene transfer seems to be common among many microbes.

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

Horizontal gene transfer makes it even more difficult to define the word "species".

Has there been separate lateral gene transfer of individual genes?