Linked from
The 86 pages that link to Horizontal gene transfer, each with the reason it gives.
TransformationNarrower topic: Transformation is one of its three major mechanisms in bacteria.
EukaryotaRelated: Gene transfer between endosymbionts and hosts helped shape eukaryotic genomes.
AquificotaRelated: Gene exchange can complicate evolutionary histories inferred for Aquificota.
ProtistologyRelated: Gene exchange complicates reconstruction of protist evolutionary histories.