miRNA and its effect

Try: www.nature.com/nature/journal/v435/n7043/full/435745a.html

Although they are tiny, microRNAs can have large-scale effects because they regulate a variety of genes microRNAs (miRNAs) — 21 to 25 nucleotides in length — are negative regulators of gene expression. The mechanisms by which they work are similar in plants and animals, implying that they are involved in fundamental cellular processes