In the early 1990s, scientists who were studying the development of a roundworm identified a small RNA molecule that regulated the expression of specific genes. This marked the discovery of microRNAs (miRNAs), which are now known to be present across all forms of life. As it turns out, these molecules play essential roles in many biological processes.
Click here for original story, A fast and efficient method for detecting microRNAs
Source: Phys.org