Length distributions in the prevalent gene set. Histograms of length distributions of putative proteins of EC = 188.8.131.52, 184.108.40.206 and 220.127.116.11 among the prevalent gene set. Upper figures: sequences carrying the leading SP in all three cases. Lower figures: sequences carrying all other SPs. Vertical dashed lines delineate the range of large sequences. The numbers of the latter are written to the right of the dashed lines. These numbers are added to those of the upper figures in order to form lower bound estimates of taxa counts.