microRNAs in animals, it has been identified in numerous species including human, dog , cat , horse , cow , guinea pig , mouse , rat , common marmoset (Callithrix jacchus), common chimpanzee (Pan troglodytes), rhesus monkey (Macaca mulatta), Sumatran orangutan (Pongo abelii), northern greater galago (Otolemur garnettii), grey short-tailed opossum