“…Furthermore, the roles of miRNAs have been described in several diseases, including cancers [70,71,72,73], coronary diseases [74,75,76], autoimmune diseases [77,78,79] or viral infections such as viral hepatitis [80,81,82,83]. miRNAs predominantly exist intracellularly, however, it is possible to find miRNAs in extracellular environments such as in serum, plasma, semen, cerebrospinal fluid and urine [84,85,86,87,88,89,90,91]. Two hypotheses are proposed to explain the origin of circulatory miRNAs.…”