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The ''Flexiviridae'' were a new family of viruses in the 2004 classification of viruses, but have since the 2009 classification been split into the three new families ''Alphaflexiviridae'', ''Betaflexiviridae'' and ''Gammaflexiviridae''. These have in turn been subsumed under the new order ''Tymovirales'' along with the old family ''Tymoviridae'' by the International Committee on Taxonomy of Viruses based on molecular phylogenetic systematic analyses of proteins (RNA polymerase and viral coat). The viruses are positive-sense ssRNA viruses, placing them in Group IV of the Baltimore classification. These viruses are filamentous and named for being highly flexible. Members of these families are readily transmitted mechanically and have other vectors of transmission. Species tend to be confined to a single host plant, many species preferring woody hosts, but a diversity of angiosperm hosts are known to the ''Flexiviridae''. Viral aggregates are known to form in the cytoplasm of plant cells. ==References== 〔 *ICTV Virus Taxonomy 2009 () *UniProt Taxonomy () 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Flexiviridae」の詳細全文を読む スポンサード リンク
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