FIG. 1.
Comparison of the observed and simulated proportions of full-length proviruses in different age categories. Large dots (shown with confidence limits) representing the observed data have been placed at the midpoints of the provirus age groups. Small dots represent the means for 1,000 generations in the simulation. Note that the proportions for loci older than 6 million years are abruptly and massively elevated because we excluded deletions that occurred before 6 mya (we examined only loci that are represented by full-length proviruses in the chimpanzee genome). Simulated deletion probabilities per generation were 10−4, 10−5, and 10−6 for 0, 1, and >1 mutations, respectively.