Bayesian phylogenetic tree of flanking sequences of MIB copies in human, great apes, M. mulatta, and M. fascicularis. Numbers at nodes are posterior probability values for node support. Braces identify strictly identical sequences differing only by the microsatellite repeat number, indicating an orthologous relationship between species, as well as allelic (microsatellite) polymorphism within a species and sometimes within the same individual. Brackets identify the shared indels. Stars pinpoint eight different well supported lineages. M. mulatta sequences are represented in green (light = individual 2B, semi-dark = 3C, dark = GenBank individual), M. fascicularis sequences are orange (individual K), pink (individual G) and purple (individual B). Hsa, Ptr, and Gor represent human, chimpanzee, and gorilla MIB sequences, respectively. Note that the two MIB5(8) copies show identical flanking sequences but a slightly different microsatellite repeat length.