Comparative genomics remains a pivotal strategy to study the evolution of gene 
organization, and this primacy is reinforced by the growing number of full 
genome sequences available in public repositories. Despite this growth, 
bioinformatic tools available to visualize and compare genomes and to infer 
evolutionary events remain restricted to two or three genomes at a time, thus 
limiting the breadth and the nature of the question that can be investigated. 
Here we present Genomicus, a new synteny browser that can represent and compare 
unlimited numbers of genomes in a broad phylogenetic view. In addition, 
Genomicus includes reconstructed ancestral gene organization, thus greatly 
facilitating the interpretation of the data.
AVAILABILITY: Genomicus is freely available for online use at 
http://www.dyogen.ens.fr/genomicus while data can be downloaded at 
ftp://ftp.biologie.ens.fr/pub/dyogen/genomicus.