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Extrapolation of strain-specific insertions. The number of specific insertions is plotted as a function of the number n of strains. For each n, markers are the 6!/[(n - 1)!·(6 - n)!] values obtained for the different strain combinations. The continuous curve represents the least-squares fit of the function Fs(n) = κs exp [-n/τs] + Ω where κs = 578.35 ± 198.07, -1/τs = -1.36 ± 0.18 and Ω = 5.1 ± 1.1. The best fit was obtained with a correlation of 0.998.
