Lateral gene transfer (LGT) is the transmission of genes, sometimes across species barriers, outwith the classic vertical inheritance from parent to offspring. LGT is recognized as an important phenomenon that has shaped the genomes and biology of prokaryotes. Whether LGT in eukaryotes is important and widespread remains controversial. A study in BMC Biology concludes that LGT in eukaryotes is neither continuous nor prevalent and suggests a rule of thumb for judging when apparent LGT may reflect contamination.
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