Trend in the evolution of leaderless genes. 903 bacterial genomes are put into 15 bins according to their distances to the root (between bacteria and archaea) on 16S rRNA tree. Average proportion of leaderless genes in each bin is calculated. The proportion of leaderless gene shows a rapid decrease followed by fluctuation at a low level.
Zheng et al. BMC Genomics 2011 12:361 doi:10.1186/1471-2164-12-361