Description

This track contains dbSNP build 125, available from ftp.ncbi.nih.gov/snp.

Interpreting and Configuring the Graphical Display

Variants are shown as single tick marks at most zoom levels. When viewing the track at or near base-level resolution, the displayed width of the SNP corresponds to the width of the variant in the reference sequence. Insertions are indicated by a single tick mark displayed between two nucleotides, single nucleotide polymorphisms are displayed as the width of a single base, and multiple nucleotide variants are represented by a block that spans two or more bases.

The configuration categories reflect the following definitions (not all categories apply to this assembly):

Insertions/Deletions

dbSNP uses a class called 'in-del'. This has been split into 'insertion' and 'deletion', based on location type. Location types 'range' and 'exact' are deletions relative to the reference assembly. Location type 'between' are insertions relative to the reference assembly. For the new location types, the class 'in-del' is preserved.

UCSC Annotations

In addition to presenting the dbSNP data, the following annotations are provided:

Data Sources