Rybo-viroxic-nucleic sequences and structures, or RVN, were part of a humanoid's genetic makeup. RVN was one of the key factors that controlled certain chemical and genetic changes in development during puberty. This was because unlike DNA, which never changed, RVN took on some additional viroxic sequences during adolescence. Those sequences determined how someone developed physically. Without those sequences, people would never mature into adults. RVN also was a feature of plants like Draebidium calimus. RVN has not been identified in real life.