Figure 3

Unfolding stability. Average unfolding stability F vs AT content for the epsilon subunit of F1F0-ATP synthase (PDB id. 1aqt, chain A), exemplified for transition-to-transversion ratio k = 2 (the data for AT content 90% is shown using a different scale for better visibility). The standard genetic code is shown as black circle (which are connected by lines for better visibility), whereas the seven naturally occurring variants studied, as listed in Fig. 2, are shown using the following color scheme: (1, blue triangle): 'The Echinoderm and Flatworm Mitochondrial Code' (NCBI transl_table = 9) [48]; (2, orange triangle): 'The Invertebrate Mitochondrial Code' (NCBI transl_table = 5) [48]; (3, magenta square): 'The Ascidian Mitochondrial Code' (NCBI transl_table = 13) [48]; (4, green square): 'The Vertebrate Mitochondrial Code' (NCBI transl_table = 2) [49]; (5, cyan diamond): 'The Yeast Mitochondrial Code' (NCBI transl_table = 3) [50]; (6, yellow diamond): 'The Ciliate, Dasycladacean and Hexamita Nuclear Code' (NCBI transl_table = 6) [51]; (7, red star): 'The Alternative Yeast Nuclear Code' (NCBI transl_table = 12) [52]. The error bars indicate the mean's standard deviation.