Non-B DB v2.0: a database of predicted non-B DNA-forming motifs and its associated tools

Nucleic Acids Res. 2013 Jan;41(Database issue):D94-D100. doi: 10.1093/nar/gks955. Epub 2012 Nov 3.


The non-B DB, available at, catalogs predicted non-B DNA-forming sequence motifs, including Z-DNA, G-quadruplex, A-phased repeats, inverted repeats, mirror repeats, direct repeats and their corresponding subsets: cruciforms, triplexes and slipped structures, in several genomes. Version 2.0 of the database revises and re-implements the motif discovery algorithms to better align with accepted definitions and thresholds for motifs, expands the non-B DNA-forming motifs coverage by including short tandem repeats and adds key visualization tools to compare motif locations relative to other genomic annotations. Non-B DB v2.0 extends the ability for comparative genomics by including re-annotation of the five organisms reported in non-B DB v1.0, human, chimpanzee, dog, macaque and mouse, and adds seven additional organisms: orangutan, rat, cow, pig, horse, platypus and Arabidopsis thaliana. Additionally, the non-B DB v2.0 provides an overall improved graphical user interface and faster query performance.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Computer Graphics
  • DNA / chemistry*
  • Databases, Nucleic Acid*
  • Dogs
  • Humans
  • Internet
  • Mice
  • Molecular Sequence Annotation
  • Nucleotide Motifs
  • Rats
  • Repetitive Sequences, Nucleic Acid
  • Software
  • User-Computer Interface


  • DNA