Micro RNA
Micro RNA (miRNA) is a type of non-coding RNA (ncRNA). miRNA molecules are about 22 nucleotides in length and are initially transcribed as a longer hairpin-structured precursor primary miRNA transcript (pri-miRNA) which is more than 1000 nucleotides long. miRNA are involved in the post-transcriptional regulation of gene expression and they typically interact with specific mRNAs through complementary base-pairing to influence the translation or stability of the target messenger RNA (mRNA) molecule.