Browser Extensible Data Format

Other names: BED

BED (Browser Extensible Data) format provides a flexible way to define the data lines that are displayed in an genome annotation track. BED lines have three required fields and nine additional optional fields. The number of fields per line must be consistent throughout any single set of data in an annotation track. The order of the optional fields is binding: lower-numbered fields must always be populated if higher-numbered fields are used.

Webpage:
http://genome.ucsc.edu/FAQ/FAQformat.html#format1

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