Poxvirus Orthologous Clusters: toward Defining the Minimum Essential Poxvirus Genome.

Identifies the conserved families of poxvirus orthologous clusters. Alleviation of the need for using multiple Internet sites for analysis; Number of gene families conserved in chordopoxviruses and vertebrate-infecting chordopoxviruses identified; Identification of annotation and sequencing updates in poxvirus genomes.