Schematic representation of the Ping-Pong Algorithm. (A) The PPA run for two data sets with orthologous genes on the common dimension. (B) The PPA run for two data sets with homologous organs on the common dimension. EH - human expression data, EM - mouse expression data, OM - mouse organs, OH - human organs, G - human and mouse one-to-one orthologs, GH - human genes, GM - mouse genes, O - homologous organs, CM - co-module.
Piasecka et al. BMC Genomics 2012 13:124 doi:10.1186/1471-2164-13-124