## Description

This track depicts gaps in the assembly of chrUn, the "unordered chromosome" for this browser. Gaps are represented as black boxes. This assembly contains two types of gaps:

- contig - gaps between scaffolds. These gaps, represented by 1000 Ns, are placeholders between scaffolds that were added as part of the construction of chrUn. Because the order and orientation between the scaffolds is unknown, contig gaps are considered to be unbridged. There are 3,031 gaps of this type, for a total of 3,031,000 bases.
- fragment - these gaps are merely locations of N's that are not in the contig gaps. They are marked as bridged gaps, although there are 30 unusual cases were a scaffold sequence happens to begin or end with a single N and thus appears adjacent to the contig gaps. There are 91,784 gaps of this type, for a total of 92,153,565 bases.