## Description

This track depicts gaps in the assembly.

Gaps are represented as black boxes in this track. If the relative order and orientation of the contigs on either side of the gap is supported by read pair data, it is a bridged gap and a white line is drawn through the black box representing the gap.

This assembly contains the following two types of gaps:

- fragment - gaps between the Whole Genome Shotgun contigs of a supercontig/scaffold. (In this context, a contig is a set of overlapping sequence reads. A supercontig/scaffold is a set of contigs ordered and oriented during the Whole Genome Shotgun process using paired-end reads.) These are represented by varying numbers of Ns in the assembly. Fragment gap sizes are usually taken from read pair data.
- scaffold - gaps between supercontigs not linked by the fingerprint map, but instead by marker data. (In this context, the "Contig" gap type refers to a map contig, not a sequence contig.) These are represented by 1,000 Ns in the assembly of the artifical chromosome chrUn (concatenation of unplaced supercontigs).

## Credits

The Jan. 2007 Pristionchus pacificus (5.0) draft assembly was produced by the Washington University School of Medicine GSC with the following data use policy.