RNA (ribonucleic acid) molecules drive much of cellular action. Messenger RNA (mRNA) relays genetic information from DNA to ribosomes to direct the formation of proteins. At the same time, noncoding RNAs act as enzymes, scaffolds, and regulatory molecules, contributing greatly to the regulation of gene activity, RNA splicing, protein synthesis, and even DNA replication. This new edition of the highly successful RNA Worlds series focuses on...