Polyribonucleotides: A group of 13 or more ribonucleotides in which the phosphate residues of each ribonucleotide act as bridges in forming diester linkages between the ribose moieties.Poly A-U: A double-stranded polyribonucleotide comprising polyadenylic and polyuridylic acids.PolynucleotidesCytosine NucleotidesHexobarbital: A barbiturate that is effective as a hypnotic and sedative.Ribonucleases: Enzymes that catalyze the hydrolysis of ester bonds within RNA. EC 3.1.-.Poly I-C: Interferon inducer consisting of a synthetic, mismatched double-stranded RNA. The polymer is made of one strand each of polyinosinic acid and polycytidylic acid.Uracil NucleotidesGuanine NucleotidesAdenine NucleotidesRNA: A polynucleotide consisting essentially of chains with a repeating backbone of phosphate and ribose units to which nitrogenous bases are attached. RNA is unique among biological macromolecules in that it can encode genetic information, serve as an abundant structural component of cells, and also possesses catalytic activity. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)Kinetics: The rate dynamics in chemical or physical systems.