We know that genetic elements can be transferred between species in the same domain and even between species in different domains through horizontal gene transfer (HGT). Moreira and Brochier-Armanet argue that the Mimivirus genome contains genes acquired from several sources via HGT.
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Mimivirus is the largest and most complex virus known. Is it an evolutionary bridge between nonliving viruses and living organisms, or is it just an anomaly?
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