Fig. 1

Fraction of total and promiscuous enzymes as function of genome size. On the X axis, 761 bacterial and archaeal genomes are sorted by the number of ORFs and the fraction of enzymes is shown on the Y axis. a The proportion of total enzymes for each genome. b The proportion of promiscuous enzymes for each genome. In red squares, free-living organisms; in blue circles, extremophiles organisms; in green triangles, pathogens organisms; and in blue asterisks, intracellular organisms