Figure . Overview of data used to build the fish genomic lifespan predictor. Each tip of the chronogram (derived from TimeTree.org) represents a single fish species, where the root species is zebrafish (Danio rerio ). The associated CpG observed over expected ratio (O/E) in promoter regions is shown in the heatmap, where the grey colour indicates missing values (the absence of a BLAST hit). The known lifespan for each species, here defined as the mean of all reported lifespans, is represented by the height of the blue bars (range ≈ 1 – 183 years). The figure illustrates the variability in promoter coverage and fish lifespan data used to train and test the model and is labelled with eight species mentioned within the main text.