Number of gaps as a function of size in the mouse, rat, and human/ancestral rodent lineages. The frequencies of insertions and deletions <11 bp in length are plotted for the mouse and rat lineages, whereas the frequencies of insertions + deletions are plotted for the human/ancestral rodent branch. Note the rapid decline in the relative numbers of indel events as size increases, with events of size 1 occurring at a rate of >40% along both the mouse and rat lineages. Also note that the size distribution of small insertions and deletions behave very similarly to each other within each rodent lineage, as well as between lineages.
