Phylogenetic distributions of marine adaptation genes (MAGs) among the Actinobacteria. Red branches in the species tree trace the occurrence of each MAG starting from the ancestor that accounts for all strains that maintain the gene (+). Black circles indicate the point in a lineage within which all strains lack the MAG. The minimum number of gene loss events was calculated by summing the black circles. The maximum number of gene gain events was calculated by summing the red circles. Pst, Liv, Partial 2, and Mrp represent all genes in the respective operons. S = Salinispora.
Penn and Jensen BMC Genomics 2012 13:86 doi:10.1186/1471-2164-13-86