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The general feature format (gene-finding format, generic feature format, GFF) is a file format used for describing genes and other features of DNA, RNA and protein sequences. The filename extension associated with such files is .GFF.There are two versions of the GFF file format in general use: * (General Feature Format Version 2 (Sanger Institute) ) * (Generic Feature Format Version 3 (Sequence Ontology Project) ) Servers that generate this format: Clients that use this format: ==GFF Versions== (GFF Version 2 ) has a number of deficiencies, notably that it can only represent two-level feature hierarchies and thus cannot handle the three-level hierarchy of gene → transcript → exon. GFF3 addresses this and other deficiencies. For example, it supports arbitrarily many hierarchical levels, and gives specific meanings to certain tags in the attributes field. The Gene transfer format (GTF) is a refinement of GFF Version 2 and is sometimes referred to as GFF2.5.〔http://gmod.org/wiki/GFF3〕 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「General feature format」の詳細全文を読む スポンサード リンク
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