id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-252871-qfrpuy3t	Nasir, Arshan	Investigating the Concept and Origin of Viruses	2020-11-03		.txt	text/plain	5153	298	46	We propose a new definition of viruses that is not restricted to the presence or absence of any genetic or physical feature, detail a scenario for how viruses likely originated from ancient cells, and explain technical and conceptual biases that limit our understanding of virus evolution. We propose a new definition of viruses that is not restricted to the presence or absence of any genetic or physical feature, detail a scenario for how viruses likely originated from ancient cells, and explain technical and conceptual biases that limit our understanding of virus evolution. In turn, the origin of archaeoviruses from Archaea, bacterioviruses from Bacteria, and eukaryoviruses from Eukarya also seems less likely as these viruses share several conserved protein folds involved in virion synthesis and other functions, indicating that they may have evolved prior to the diversification of LUCA into modern cells.	./cache/cord-252871-qfrpuy3t.txt	./txt/cord-252871-qfrpuy3t.txt