Primate lineage-specifically expanded microRNA families. a. 16 primate-specific families. The microRNA family on human chromosome 19 (C19MC) is the largest cluster identified previously. The hsa-mir-1233 mainly clustered on chromosome 15 expanded further in the human genome. b. Primate-nonspecific families (9). The hsa-mir-622 family seems to be further expanded in the primate lineage.
Du et al. BMC Genomics 2013 14:98 doi:10.1186/1471-2164-14-98