Figure 5.
Distribution of the counts of blocks of n consecutive conserved bases between S. cerevisiae and S. bayanus as a function of n. The solid line is the distribution for simulated neutral sequence. The small n values of the simulated curve and the real curve overlap well when the simulated curve is scaled by a factor 0.732 (dashed line), suggesting that 73% of the promoter sequence evolves neutrally and 27% is under selection. The inset shows the probability that a block conserved between S. cerevisiae and S. bayanus is functional, given its length n.
