Species-specific sets of chromosomes-karyotypes-are traditionally depicted as 
linear ideograms with individual chromosomes represented by vertical bars. 
However, linear visualization has its limitations when the shared collinearity 
and/or chromosomal rearrangements differentiating two or more karyotypes need to 
be demonstrated. In these instances, circular visualization might provide easier 
comprehension and interpretation of inter-species chromosomal collinearity. The 
chromDraw graphical tool was developed as a user-friendly graphical tool for 
visualizing both linear and circular karyotypes based on the same input data 
matrix. The output graphics, saved in two different formats (EPS and SVG), can 
be easily imported to and modified in presentation and image-editing computer 
programs. The tool is freely distributed under GNU General Public License (GPL) 
and can be installed from Bioconductor or from the chromDraw home page.