Distribution of CENP-B and related pogo-derived genes. Solid figures indicate apparent extant genes, as evidenced by the presence of uninterrupted ORFs and dN/dS <0.5 and significantly <1. Unshaded figures indicate putative genes exhibiting dN/dS <0.5 and significantly <1, which contain one or more apparent frameshift and/or nonsense mutations. The Greek letter ψ indicates probable pseudogenes, which, in addition to harboring apparent frameshift and nonsense mutations, exhibit dN/dS >0.5 and not significantly <1. Assembled, high coverage genomes (NHGRI, NIH, http://www.genome.gov/10002154) are in bold print. A dash indicates the absence of a detected ortholog in an assembled, high coverage genome.