Gain-loss dynamics of green algal elongation factor genes and their inferred presence in ancestral genomes. Gain and loss rates, as well as the estimated probabilities for presence of the genes in ancestral genomes are given for a variety of analysis conditions. Panels A-C show the outcome of models in which EF-1α and EFL gain and loss rates were not constrained. In panels D-F, the gain rate of EF-1α was constrained to be 10-6. Colors were used to visualize estimated probabilities for presence of genes along the tree. Red indicates a high probability for EF-1α, blue marks a high probability of EFL and yellow stands for a high probability of the presence of both genes. Intermediate colors indicate uncertainty.