## Description

This track depicts gaps in the assembly. These gaps - with the exception of intractable centromeric gaps - will be closed during the finishing process.

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 known, it is a bridged gap and a white line is drawn through the black box representing the gaps. In this assembly, ultracontig refers to an assembly of supercontigs (scaffolds).

This assembly contains the following principal types of gaps:

- Fragment - gaps between the ordered-and-oriented scaffolds (supercontigs) inside an ultracontig (1,000 Ns). In this context, a contig is a set of overlapping sequence reads.
- Contig - gaps between ultracontigs
  - bridged - the scaffolds within the ultracontigs are ordered and oriented (50,000 Ns).
  - unbridged - the scaffolds and ultracontigs are assigned to a chromosome but are not ordered/oriented (chrN_random) or are not assigned to a chromsome (chrUn_random) (2,000 Ns).
- Centromere - gaps from centromeres (500,000 Ns).