id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-315781-dejh8q22	Konishi, Tomokazu	Re-evaluation of the evolution of influenza H1 viruses using direct PCA	2019-12-17		.txt	text/plain	4590	308	65	It should be noted that avian viruses showed lower PC values and appeared around the centre of the PCA, while swine and human viruses exhibited extreme values (Figs. Thus, avian viruses had sequences that were similar to the average among samples at amino acids that were characteristic to the three groups of human and swine viruses: R, M, and U. Avian samples also showed characteristic motifs at other positions, which may appear in lower PCs. The relationships observed among the strains presented here are different from the classic ones 4, [8] [9] [10] [11] [12] in several elements. www.nature.com/scientificreports www.nature.com/scientificreports/ One of the major differences observed was the direct shift from avian to swine or human viruses. Drifts and spreading: the genomes of the R group of human viruses have been changing yearly (Figs.	./cache/cord-315781-dejh8q22.txt	./txt/cord-315781-dejh8q22.txt