Figure 1

Intron density in the genes of some modern eukaryotes and the reconstructed common ancestor of plants and animal (possible LECA under unicont-bicont phylogeny). The marks on the line show approximate intron density values (mean number of introns per gene); the data is from [99]. The reconstructed values for the ancestral genome (in red) are denoted after the reconstruction method: MCMC, Markov Chain Monte Carlo[49]; MP, maximum parsimony[23]; ML, maximum likelihood[41]; ML/MP, hybrid maximum likelihood/parsimony method[51].