General feature format
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:
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.
GFF general structure
All GFF formats (GFF2, GFF3 and GTF) are tabular files with 9 fields per line, separated by tabs. They all share the same structure for the first 7 fields, while differing in the definition of the eighth field and in the content and format of the ninth field. The general structure is as follows:
Geologiska föreningen
Geologiska föreningen is a scientific learned society founded in Sweden in 1871. The society was formerly known as Geologiska föreningen i Stockholm. It publishes the quarterly scientific journal GFF (formerly Geologiska föreningens förhandlingar) and the quartlerly magazine Geologisk forum.
