Effect of lifestyle on use of protein F in proteomes. (A) F usage in proteomes, sorted in descending order. (FL) Free-living; (P) parasitic; (OP) obligate parasitic lifestyle. (B) Pie charts of the protein repertoire within the superkingdoms of life. The size of each pie chart is proportional to the genomic abundance of F within the respective superkingdom, and percentages represent the fraction of total abundance designated by each sector. F are identified as superkingdom-specific (A, B, or E), or shared by some (AB, BE, or AE) or by all (ABE) superkingdoms. ABE F are further divided into those that are omnipresent F shared by all organisms (ABEo) and those that appeared before (ABE < 439) or after (ABE > 439) d.229, the first F unique to Bacteria that delimits the upper bound of the organismal specification epoch at ndF = 0.439.
