Identification of K111 proviruses in individual human chromosomes. Bayesian inference tree of the 5′ LTR and 3′ LTRs, and flanking CER:D22Z3 sequences, of K111 proviruses amplified from human chromosomes. Sequences are colored to indicate from which human chromosome they arise. Note that each color tends to cluster to specific evolutionary branches, indicating that individual K111s often spread within an individual chromosome. Posterior probability values greater than 70 are shown for an unrooted tree. The tree was generated using Bayesian inference with four independent chains run for at least 1,000,000 generations until sufficient trees were sampled to generate >99% credibility. 5′ (black) and 3′ (blue) LTRs and solo LTR (red) lineages are shown along with the chimpanzee LTRs (CERV-K111). Informative nucleotide sequence substitutions were found that are specific for the K111 group of sequences found in each chromosome.