id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-290481-i2ppvsh5	Dolja, Valerian V.	Comparative and functional genomics of closteroviruses	2006-03-09		.txt	text/plain	9298	455	47	It was concluded that, at least in part, viral pathogenicity is due to interference of silencing suppressors with developmental function of plant small RNAs. Despite their mechanistic similarity, p21 and p19 appear to be structurally and evolutionarily unrelated and neither has detectable homologues outside the respective virus genera (Vargason et al., 2003; Ye and Patel, 2005) . Although Citrus tristeza virus (CTV) encodes p20, a p21like suppressor of RNA silencing, screening of the CTV genome revealed an additional suppressor, p23, that has no homologues in other closteroviruses (Fig. 2) (Lu et al., 2004) . A comparison of TMV and BYV, which both evolved from the alphavirus-like ancestors, shows that the large part of the ∼9 kb genomic surplus of BYV is dedicated to facilitating the synthesis of the virion RNA and multiple sgRNAs. The rest of the surplus was invested in the formation of the complex virion tail that empowers virus transport within and transmission between the host plants and in suppression of RNA silencing (Fig. 1) .	./cache/cord-290481-i2ppvsh5.txt	./txt/cord-290481-i2ppvsh5.txt