Chromosomal distribution of piRNA clusters in Macaca mulatta. Bars on chromosomes indicate the locations of detected piRNA clusters. Each associated circle refers to the method with which this cluster could be detected (blue: proTRAC, green: method applied by Girard et al. , orange: method applied by Lau et al. ). Chromosome numbers are stated below the chromosomes. No clusters could be detected on chromosomes 6 and 11, as well as on the Y chromosome.
Rosenkranz and Zischler BMC Bioinformatics 2012 13:5 doi:10.1186/1471-2105-13-5